diff --git a/ios/TimeTracker/README.md b/ios/TimeTracker/README.md
new file mode 100644
index 0000000..16bd562
--- /dev/null
+++ b/ios/TimeTracker/README.md
@@ -0,0 +1,89 @@
+# TimeTracker iOS App
+
+## Setup Instructions
+
+### Prerequisites
+
+1. **XcodeGen** - Required to generate the Xcode project
+   ```bash
+   # On macOS:
+   brew install xcodegen
+   
+   # Or via npm:
+   npm install -g xcodegen
+   ```
+
+2. **Xcode** - For building the iOS app (macOS only)
+
+### Project Generation
+
+After installing XcodeGen, generate the project:
+
+```bash
+cd ios/TimeTracker
+xcodegen generate
+```
+
+This will create `TimeTracker.xcodeproj` in the `ios/TimeTracker` directory.
+
+### Configuration
+
+Before building, configure the API base URL:
+
+1. Open `TimeTracker.xcodeproj` in Xcode
+2. Select the TimeTracker target
+3. Go to Info.plist
+4. Add or modify `API_BASE_URL` with your backend URL:
+   - For development: `http://localhost:3001`
+   - For production: Your actual API URL
+
+### Building
+
+Open the project in Xcode and build:
+
+```bash
+open ios/TimeTracker/TimeTracker.xcodeproj
+```
+
+Then select your target device/simulator and press Cmd+B to build.
+
+### Authentication Setup
+
+1. Configure your OIDC provider settings in the backend
+2. The iOS app uses ASWebAuthenticationSession for OAuth
+3. The callback URL scheme is `timetracker://oauth/callback`
+
+### App Groups
+
+For the widget to work with the main app, configure the App Group:
+- Identifier: `group.com.timetracker.app`
+- This is already configured in the project.yml
+
+### Dependencies
+
+The project uses Swift Package Manager for dependencies:
+- [SQLite.swift](https://github.com/stephencelis/SQLite.swift) - Local database
+- [KeychainAccess](https://github.com/kishikawakatsumi/KeychainAccess) - Secure storage
+
+## Project Structure
+
+```
+TimeTracker/
+├── TimeTrackerApp/          # App entry point
+├── Core/
+│   ├── Network/             # API client
+│   ├── Auth/               # Authentication
+│   └── Persistence/        # SQLite + sync
+├── Features/
+│   ├── Auth/              # Login
+│   ├── Timer/              # Timer (core feature)
+│   ├── TimeEntries/       # Time entries CRUD
+│   ├── Projects/          # Projects CRUD
+│   ├── Clients/           # Clients CRUD
+│   └── Dashboard/         # Dashboard
+├── Models/                  # Data models
+├── Shared/                  # Extensions & components
+└── Resources/              # Assets
+
+TimeTrackerWidget/           # iOS Widget Extension
+```
diff --git a/ios/TimeTracker/TimeTracker/Core/Auth/AuthManager.swift b/ios/TimeTracker/TimeTracker/Core/Auth/AuthManager.swift
new file mode 100644
index 0000000..fe0bdbb
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Core/Auth/AuthManager.swift
@@ -0,0 +1,91 @@
+import Foundation
+import KeychainAccess
+
+@MainActor
+final class AuthManager: ObservableObject {
+    static let shared = AuthManager()
+    
+    @Published private(set) var isAuthenticated = false
+    @Published private(set) var currentUser: User?
+    
+    private let keychain: Keychain
+    private let apiClient = APIClient()
+    
+    var accessToken: String? {
+        get { try? keychain.get(AppConstants.KeychainKeys.accessToken) }
+        set {
+            if let value = newValue {
+                try? keychain.set(value, key: AppConstants.KeychainKeys.accessToken)
+            } else {
+                try? keychain.remove(AppConstants.KeychainKeys.accessToken)
+            }
+        }
+    }
+    
+    var idToken: String? {
+        get { try? keychain.get(AppConstants.KeychainKeys.idToken) }
+        set {
+            if let value = newValue {
+                try? keychain.set(value, key: AppConstants.KeychainKeys.idToken)
+            } else {
+                try? keychain.remove(AppConstants.KeychainKeys.idToken)
+            }
+        }
+    }
+    
+    private init() {
+        self.keychain = Keychain(service: "com.timetracker.app")
+            .accessibility(.whenUnlockedThisDeviceOnly)
+    }
+    
+    func checkAuthState() async {
+        guard accessToken != nil else {
+            isAuthenticated = false
+            return
+        }
+        
+        do {
+            let user: User = try await apiClient.request(
+                endpoint: APIEndpoint.me,
+                authenticated: true
+            )
+            currentUser = user
+            isAuthenticated = true
+        } catch {
+            clearAuth()
+        }
+    }
+    
+    func fetchCurrentUser() async throws -> User {
+        let user: User = try await apiClient.request(
+            endpoint: APIEndpoint.me,
+            authenticated: true
+        )
+        currentUser = user
+        return user
+    }
+    
+    func logout() async throws {
+        try await apiClient.requestVoid(
+            endpoint: APIEndpoint.logout,
+            method: .post,
+            authenticated: true
+        )
+        clearAuth()
+    }
+    
+    func clearAuth() {
+        accessToken = nil
+        idToken = nil
+        currentUser = nil
+        isAuthenticated = false
+    }
+    
+    var loginURL: URL {
+        APIEndpoints.url(for: APIEndpoint.login)
+    }
+    
+    var callbackURL: String {
+        AppConfig.authCallbackURL
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Core/Auth/AuthService.swift b/ios/TimeTracker/TimeTracker/Core/Auth/AuthService.swift
new file mode 100644
index 0000000..50be985
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Core/Auth/AuthService.swift
@@ -0,0 +1,141 @@
+import Foundation
+import AuthenticationServices
+import CryptoKit
+
+final class AuthService: NSObject {
+    static let shared = AuthService()
+    
+    private var authSession: ASWebAuthenticationSession?
+    private var presentationAnchor: ASPresentationAnchor?
+    
+    private override init() {
+        super.init()
+    }
+    
+    func login(presentationAnchor: ASPresentationAnchor) async throws -> URL? {
+        self.presentationAnchor = presentationAnchor
+        
+        let codeVerifier = generateCodeVerifier()
+        let codeChallenge = generateCodeChallenge(from: codeVerifier)
+        
+        let session = UUID().uuidString
+        UserDefaults.standard.set(codeVerifier, forKey: "oidc_code_verifier_\(session)")
+        
+        var components = URLComponents(
+            url: AppConfig.apiBaseURL.appendingPathComponent(APIEndpoint.login),
+            resolvingAgainstBaseURL: true
+        )
+        
+        components?.queryItems = [
+            URLQueryItem(name: "session", value: session),
+            URLQueryItem(name: "code_challenge", value: codeChallenge),
+            URLQueryItem(name: "code_challenge_method", value: "S256"),
+            URLQueryItem(name: "redirect_uri", value: AppConfig.authCallbackURL)
+        ]
+        
+        guard let authURL = components?.url else {
+            throw AuthError.invalidURL
+        }
+        
+        let callbackScheme = URL(string: AppConfig.authCallbackURL)?.scheme ?? "timetracker"
+        
+        let webAuthSession = ASWebAuthenticationSession(
+            url: authURL,
+            callbackURLScheme: callbackScheme
+        ) { [weak self] callbackURL, error in
+            if let error = error {
+                if (error as? ASWebAuthenticationSessionError)?.code == .canceledLogin {
+                    throw AuthError.cancelled
+                }
+                throw AuthError.failed(error.localizedDescription)
+            }
+            
+            guard let callbackURL = callbackURL else {
+                throw AuthError.noCallback
+            }
+            
+            self?.handleCallback(url: callbackURL, session: session)
+        }
+        
+        webAuthSession.presentationContextProvider = self
+        webAuthSession.prefersEphemeralWebBrowserSession = false
+        
+        self.authSession = webAuthSession
+        
+        return await withCheckedContinuation { continuation in
+            webAuthSession.start { started in
+                if !started {
+                    continuation.resume(returning: nil)
+                }
+            }
+        }
+    }
+    
+    private func handleCallback(url: URL, session: String) {
+        guard let components = URLComponents(url: url, resolvingAgainstBaseURL: true),
+              let code = components.queryItems?.first(where: { $0.name == "code" })?.value else {
+            return
+        }
+        
+        let codeVerifier = UserDefaults.standard.string(forKey: "oidc_code_verifier_\(session)")
+        
+        DispatchQueue.main.async {
+            NotificationCenter.default.post(
+                name: .authCallbackReceived,
+                object: nil,
+                userInfo: [
+                    "code": code,
+                    "codeVerifier": codeVerifier ?? ""
+                ]
+            )
+        }
+    }
+    
+    private func generateCodeVerifier() -> String {
+        var buffer = [UInt8](repeating: 0, count: 32)
+        _ = SecRandomCopyBytes(kSecRandomDefault, buffer.count, &buffer)
+        return Data(buffer).base64EncodedString()
+            .replacingOccurrences(of: "+", with: "-")
+            .replacingOccurrences(of: "/", with: "_")
+            .replacingOccurrences(of: "=", with: "")
+    }
+    
+    private func generateCodeChallenge(from verifier: String) -> String {
+        guard let data = verifier.data(using: .ascii) else { return "" }
+        let hash = SHA256.hash(data: data)
+        return Data(hash).base64EncodedString()
+            .replacingOccurrences(of: "+", with: "-")
+            .replacingOccurrences(of: "/", with: "_")
+            .replacingOccurrences(of: "=", with: "")
+    }
+}
+
+extension AuthService: ASWebAuthenticationPresentationContextProviding {
+    func presentationAnchor(for session: ASWebAuthenticationSession) -> ASPresentationAnchor {
+        presentationAnchor ?? ASPresentationAnchor()
+    }
+}
+
+enum AuthError: LocalizedError {
+    case invalidURL
+    case cancelled
+    case noCallback
+    case failed(String)
+    
+    var errorDescription: String? {
+        switch self {
+        case .invalidURL:
+            return "Invalid authentication URL"
+        case .cancelled:
+            return "Login was cancelled"
+        case .noCallback:
+            return "No callback received"
+        case .failed(let message):
+            return "Authentication failed: \(message)"
+        }
+    }
+}
+
+extension Notification.Name {
+    static let authCallbackReceived = Notification.Name("authCallbackReceived")
+}
diff --git a/ios/TimeTracker/TimeTracker/Core/Constants.swift b/ios/TimeTracker/TimeTracker/Core/Constants.swift
new file mode 100644
index 0000000..123180b
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Core/Constants.swift
@@ -0,0 +1,32 @@
+import Foundation
+
+enum AppConstants {
+    static let appGroupIdentifier = "group.com.timetracker.app"
+    static let authCallbackScheme = "timetracker"
+    static let authCallbackHost = "oauth"
+    
+    enum UserDefaultsKeys {
+        static let hasSeenOnboarding = "hasSeenOnboarding"
+        static let cachedTimer = "cachedTimer"
+        static let lastSyncDate = "lastSyncDate"
+    }
+    
+    enum KeychainKeys {
+        static let accessToken = "accessToken"
+        static let idToken = "idToken"
+    }
+}
+
+struct AppConfig {
+    static var apiBaseURL: URL {
+        if let url = Bundle.main.object(forInfoDictionaryKey: "API_BASE_URL") as? String,
+           let baseURL = URL(string: url) {
+            return baseURL
+        }
+        return URL(string: "http://localhost:3001")!
+    }
+    
+    static var authCallbackURL: String {
+        "\(AppConstants.authCallbackScheme)://\(AppConstants.authCallbackHost)/callback"
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Core/Network/APIClient.swift b/ios/TimeTracker/TimeTracker/Core/Network/APIClient.swift
new file mode 100644
index 0000000..c342917
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Core/Network/APIClient.swift
@@ -0,0 +1,160 @@
+import Foundation
+
+actor APIClient {
+    private let session: URLSession
+    private let decoder: JSONDecoder
+    private let encoder: JSONEncoder
+    
+    init() {
+        let config = URLSessionConfiguration.default
+        config.timeoutIntervalForRequest = 30
+        config.timeoutIntervalForResource = 60
+        self.session = URLSession(configuration: config)
+        
+        self.decoder = JSONDecoder()
+        self.encoder = JSONEncoder()
+    }
+    
+    func request<T: Decodable>(
+        endpoint: String,
+        method: HTTPMethod = .get,
+        body: Encodable? = nil,
+        queryItems: [URLQueryItem]? = nil,
+        authenticated: Bool = true
+    ) async throws -> T {
+        var urlComponents = URLComponents(
+            url: APIEndpoints.url(for: endpoint),
+            resolvingAgainstBaseURL: true
+        )
+        
+        if let queryItems = queryItems, !queryItems.isEmpty {
+            urlComponents?.queryItems = queryItems
+        }
+        
+        guard let url = urlComponents?.url else {
+            throw NetworkError.invalidURL
+        }
+        
+        var request = URLRequest(url: url)
+        request.httpMethod = method.rawValue
+        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
+        request.setValue("application/json", forHTTPHeaderField: "Accept")
+        
+        if authenticated {
+            guard let token = AuthManager.shared.accessToken else {
+                throw NetworkError.unauthorized
+            }
+            request.setValue("Bearer \(token)", forHTTPHeaderField: "Authorization")
+        }
+        
+        if let body = body {
+            request.httpBody = try encoder.encode(body)
+        }
+        
+        do {
+            let (data, response) = try await session.data(for: request)
+            
+            guard let httpResponse = response as? HTTPURLResponse else {
+                throw NetworkError.invalidResponse
+            }
+            
+            if httpResponse.statusCode == 401 {
+                await MainActor.run {
+                    AuthManager.shared.clearAuth()
+                }
+                throw NetworkError.unauthorized
+            }
+            
+            guard (200...299).contains(httpResponse.statusCode) else {
+                let message = try? decoder.decode(ErrorResponse.self, from: data).error
+                throw NetworkError.httpError(statusCode: httpResponse.statusCode, message: message)
+            }
+            
+            if data.isEmpty {
+                let empty: T? = nil
+                return try decoder.decode(T.self, from: "{}".data(using: .utf8)!)
+            }
+            
+            return try decoder.decode(T.self, from: data)
+        } catch let error as NetworkError {
+            throw error
+        } catch let error as DecodingError {
+            throw NetworkError.decodingError(error)
+        } catch {
+            throw NetworkError.networkError(error)
+        }
+    }
+    
+    func requestVoid(
+        endpoint: String,
+        method: HTTPMethod = .get,
+        body: Encodable? = nil,
+        queryItems: [URLQueryItem]? = nil,
+        authenticated: Bool = true
+    ) async throws {
+        var urlComponents = URLComponents(
+            url: APIEndpoints.url(for: endpoint),
+            resolvingAgainstBaseURL: true
+        )
+        
+        if let queryItems = queryItems, !queryItems.isEmpty {
+            urlComponents?.queryItems = queryItems
+        }
+        
+        guard let url = urlComponents?.url else {
+            throw NetworkError.invalidURL
+        }
+        
+        var request = URLRequest(url: url)
+        request.httpMethod = method.rawValue
+        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
+        request.setValue("application/json", forHTTPHeaderField: "Accept")
+        
+        if authenticated {
+            guard let token = AuthManager.shared.accessToken else {
+                throw NetworkError.unauthorized
+            }
+            request.setValue("Bearer \(token)", forHTTPHeaderField: "Authorization")
+        }
+        
+        if let body = body {
+            request.httpBody = try encoder.encode(body)
+        }
+        
+        do {
+            let (data, response) = try await session.data(for: request)
+            
+            guard let httpResponse = response as? HTTPURLResponse else {
+                throw NetworkError.invalidResponse
+            }
+            
+            if httpResponse.statusCode == 401 {
+                await MainActor.run {
+                    AuthManager.shared.clearAuth()
+                }
+                throw NetworkError.unauthorized
+            }
+            
+            guard (200...299).contains(httpResponse.statusCode) else {
+                let message = try? decoder.decode(ErrorResponse.self, from: data).error
+                throw NetworkError.httpError(statusCode: httpResponse.statusCode, message: message)
+            }
+        } catch let error as NetworkError {
+            throw error
+        } catch {
+            throw NetworkError.networkError(error)
+        }
+    }
+}
+
+enum HTTPMethod: String {
+    case get = "GET"
+    case post = "POST"
+    case put = "PUT"
+    case delete = "DELETE"
+    case patch = "PATCH"
+}
+
+struct ErrorResponse: Codable {
+    let error: String?
+}
diff --git a/ios/TimeTracker/TimeTracker/Core/Network/APIEndpoints.swift b/ios/TimeTracker/TimeTracker/Core/Network/APIEndpoints.swift
new file mode 100644
index 0000000..c4d80bb
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Core/Network/APIEndpoints.swift
@@ -0,0 +1,33 @@
+import Foundation
+
+enum APIEndpoint {
+    // Auth
+    static let login = "/auth/login"
+    static let callback = "/auth/callback"
+    static let logout = "/auth/logout"
+    static let me = "/auth/me"
+    
+    // Clients
+    static let clients = "/api/clients"
+    static func client(id: String) -> String { "/api/clients/\(id)" }
+    
+    // Projects
+    static let projects = "/api/projects"
+    static func project(id: String) -> String { "/api/projects/\(id)" }
+    
+    // Time Entries
+    static let timeEntries = "/api/time-entries"
+    static let timeEntriesStatistics = "/api/time-entries/statistics"
+    static func timeEntry(id: String) -> String { "/api/time-entries/\(id)" }
+    
+    // Timer
+    static let timer = "/api/timer"
+    static let timerStart = "/api/timer/start"
+    static let timerStop = "/api/timer/stop"
+}
+
+struct APIEndpoints {
+    static func url(for endpoint: String) -> URL {
+        AppConfig.apiBaseURL.appendingPathComponent(endpoint)
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Core/Network/NetworkError.swift b/ios/TimeTracker/TimeTracker/Core/Network/NetworkError.swift
new file mode 100644
index 0000000..93c713b
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Core/Network/NetworkError.swift
@@ -0,0 +1,30 @@
+import Foundation
+
+enum NetworkError: LocalizedError {
+    case invalidURL
+    case invalidResponse
+    case httpError(statusCode: Int, message: String?)
+    case decodingError(Error)
+    case networkError(Error)
+    case unauthorized
+    case offline
+    
+    var errorDescription: String? {
+        switch self {
+        case .invalidURL:
+            return "Invalid URL"
+        case .invalidResponse:
+            return "Invalid response from server"
+        case .httpError(let statusCode, let message):
+            return message ?? "HTTP Error: \(statusCode)"
+        case .decodingError(let error):
+            return "Failed to decode response: \(error.localizedDescription)"
+        case .networkError(let error):
+            return "Network error: \(error.localizedDescription)"
+        case .unauthorized:
+            return "Unauthorized. Please log in again."
+        case .offline:
+            return "No internet connection"
+        }
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Core/Persistence/DatabaseService.swift b/ios/TimeTracker/TimeTracker/Core/Persistence/DatabaseService.swift
new file mode 100644
index 0000000..781a501
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Core/Persistence/DatabaseService.swift
@@ -0,0 +1,276 @@
+import Foundation
+import SQLite
+
+actor DatabaseService {
+    static let shared = DatabaseService()
+    
+    private var db: Connection?
+    
+    private let clients = Table("clients")
+    private let projects = Table("projects")
+    private let timeEntries = Table("time_entries")
+    private let pendingSync = Table("pending_sync")
+    
+    // Clients columns
+    private let id = SQLite.Expression<String>("id")
+    private let name = SQLite.Expression<String>("name")
+    private let description = SQLite.Expression<String?>("description")
+    private let createdAt = SQLite.Expression<String>("created_at")
+    private let updatedAt = SQLite.Expression<String>("updated_at")
+    
+    // Projects columns
+    private let projectClientId = SQLite.Expression<String>("client_id")
+    private let clientName = SQLite.Expression<String>("client_name")
+    private let color = SQLite.Expression<String?>("color")
+    
+    // Time entries columns
+    private let startTime = SQLite.Expression<String>("start_time")
+    private let endTime = SQLite.Expression<String>("end_time")
+    private let projectId = SQLite.Expression<String>("project_id")
+    private let projectName = SQLite.Expression<String>("project_name")
+    private let projectColor = SQLite.Expression<String?>("project_color")
+    private let entryDescription = SQLite.Expression<String?>("description")
+    
+    // Pending sync columns
+    private let syncId = SQLite.Expression<String>("id")
+    private let syncType = SQLite.Expression<String>("type")
+    private let syncAction = SQLite.Expression<String>("action")
+    private let syncPayload = SQLite.Expression<String>("payload")
+    private let syncCreatedAt = SQLite.Expression<String>("created_at")
+    
+    private init() {
+        setupDatabase()
+    }
+    
+    private func setupDatabase() {
+        do {
+            let fileManager = FileManager.default
+            let appGroupURL = fileManager.containerURL(
+                forSecurityApplicationGroupIdentifier: AppConstants.appGroupIdentifier
+            )
+            let dbURL = appGroupURL?.appendingPathComponent("timetracker.sqlite3")
+                ?? URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent("timetracker.sqlite3")
+            
+            db = try Connection(dbURL.path)
+            
+            try createTables()
+        } catch {
+            print("Database setup error: \(error)")
+        }
+    }
+    
+    private func createTables() throws {
+        guard let db = db else { return }
+        
+        try db.run(clients.create(ifNotExists: true) { t in
+            t.column(id, primaryKey: true)
+            t.column(name)
+            t.column(description)
+            t.column(createdAt)
+            t.column(updatedAt)
+        })
+        
+        try db.run(projects.create(ifNotExists: true) { t in
+            t.column(id, primaryKey: true)
+            t.column(name)
+            t.column(description)
+            t.column(color)
+            t.column(projectClientId)
+            t.column(clientName)
+            t.column(createdAt)
+            t.column(updatedAt)
+        })
+        
+        try db.run(timeEntries.create(ifNotExists: true) { t in
+            t.column(id, primaryKey: true)
+            t.column(startTime)
+            t.column(endTime)
+            t.column(entryDescription)
+            t.column(projectId)
+            t.column(projectName)
+            t.column(projectColor)
+            t.column(createdAt)
+            t.column(updatedAt)
+        })
+        
+        try db.run(pendingSync.create(ifNotExists: true) { t in
+            t.column(syncId, primaryKey: true)
+            t.column(syncType)
+            t.column(syncAction)
+            t.column(syncPayload)
+            t.column(syncCreatedAt)
+        })
+    }
+    
+    // MARK: - Clients
+    
+    func saveClients(_ clientList: [Client]) throws {
+        guard let db = db else { return }
+        
+        try db.run(clients.delete())
+        
+        for client in clientList {
+            try db.run(clients.insert(
+                id <- client.id,
+                name <- client.name,
+                description <- client.description,
+                createdAt <- client.createdAt,
+                updatedAt <- client.updatedAt
+            ))
+        }
+    }
+    
+    func fetchClients() throws -> [Client] {
+        guard let db = db else { return [] }
+        
+        return try db.prepare(clients).map { row in
+            Client(
+                id: row[id],
+                name: row[name],
+                description: row[description],
+                createdAt: row[createdAt],
+                updatedAt: row[updatedAt]
+            )
+        }
+    }
+    
+    // MARK: - Projects
+    
+    func saveProjects(_ projectList: [Project]) throws {
+        guard let db = db else { return }
+        
+        try db.run(projects.delete())
+        
+        for project in projectList {
+            try db.run(projects.insert(
+                id <- project.id,
+                name <- project.name,
+                description <- project.description,
+                color <- project.color,
+                projectClientId <- project.clientId,
+                clientName <- project.client.name,
+                createdAt <- project.createdAt,
+                updatedAt <- project.updatedAt
+            ))
+        }
+    }
+    
+    func fetchProjects() throws -> [Project] {
+        guard let db = db else { return [] }
+        
+        return try db.prepare(projects).map { row in
+            let client = ClientReference(id: row[projectClientId], name: row[clientName])
+            let projectRef = ProjectReference(id: row[id], name: row[name], color: row[color], client: client)
+            
+            return Project(
+                id: row[id],
+                name: row[name],
+                description: row[description],
+                color: row[color],
+                clientId: row[projectClientId],
+                client: client,
+                createdAt: row[createdAt],
+                updatedAt: row[updatedAt]
+            )
+        }
+    }
+    
+    // MARK: - Time Entries
+    
+    func saveTimeEntries(_ entries: [TimeEntry]) throws {
+        guard let db = db else { return }
+        
+        try db.run(timeEntries.delete())
+        
+        for entry in entries {
+            try db.run(timeEntries.insert(
+                id <- entry.id,
+                startTime <- entry.startTime,
+                endTime <- entry.endTime,
+                entryDescription <- entry.description,
+                projectId <- entry.projectId,
+                projectName <- entry.project.name,
+                projectColor <- entry.project.color,
+                createdAt <- entry.createdAt,
+                updatedAt <- entry.updatedAt
+            ))
+        }
+    }
+    
+    func fetchTimeEntries() throws -> [TimeEntry] {
+        guard let db = db else { return [] }
+        
+        return try db.prepare(timeEntries).map { row in
+            let client = ClientReference(id: "", name: "")
+            let projectRef = ProjectReference(
+                id: row[projectId],
+                name: row[projectName],
+                color: row[projectColor],
+                client: client
+            )
+            
+            return TimeEntry(
+                id: row[id],
+                startTime: row[startTime],
+                endTime: row[endTime],
+                description: row[entryDescription],
+                projectId: row[projectId],
+                project: projectRef,
+                createdAt: row[createdAt],
+                updatedAt: row[updatedAt]
+            )
+        }
+    }
+    
+    // MARK: - Pending Sync
+    
+    func addPendingSync(type: String, action: String, payload: String) throws {
+        guard let db = db else { return }
+        
+        try db.run(pendingSync.insert(
+            syncId <- UUID().uuidString,
+            syncType <- type,
+            syncAction <- action,
+            syncPayload <- payload,
+            syncCreatedAt <- ISO8601DateFormatter().string(from: Date())
+        ))
+    }
+    
+    func fetchPendingSync() throws -> [(id: String, type: String, action: String, payload: String)] {
+        guard let db = db else { return [] }
+        
+        return try db.prepare(pendingSync).map { row in
+            (row[syncId], row[syncType], row[syncAction], row[syncPayload])
+        }
+    }
+    
+    func removePendingSync(id: String) throws {
+        guard let db = db else { return }
+        
+        try db.run(pendingSync.filter(syncId == id).delete())
+    }
+    
+    // MARK: - Timer Cache
+    
+    func cacheTimer(_ timer: OngoingTimer?) throws {
+        guard let db = db else { return }
+        
+        let encoder = JSONEncoder()
+        
+        if let timer = timer {
+            let data = try encoder.encode(timer)
+            UserDefaults(suiteName: AppConstants.appGroupIdentifier)?.set(data, forKey: AppConstants.UserDefaultsKeys.cachedTimer)
+        } else {
+            UserDefaults(suiteName: AppConstants.appGroupIdentifier)?.removeObject(forKey: AppConstants.UserDefaultsKeys.cachedTimer)
+        }
+    }
+    
+    func getCachedTimer() throws -> OngoingTimer? {
+        let data = UserDefaults(suiteName: AppConstants.appGroupIdentifier)?.data(forKey: AppConstants.UserDefaultsKeys.cachedTimer)
+        
+        guard let data = data else { return nil }
+        
+        let decoder = JSONDecoder()
+        return try decoder.decode(OngoingTimer.self, from: data)
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Core/Persistence/SyncManager.swift b/ios/TimeTracker/TimeTracker/Core/Persistence/SyncManager.swift
new file mode 100644
index 0000000..f655a18
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Core/Persistence/SyncManager.swift
@@ -0,0 +1,163 @@
+import Foundation
+import Network
+
+@MainActor
+final class SyncManager: ObservableObject {
+    static let shared = SyncManager()
+    
+    @Published private(set) var isOnline = true
+    @Published private(set) var isSyncing = false
+    
+    private let monitor = NWPathMonitor()
+    private let monitorQueue = DispatchQueue(label: "com.timetracker.networkmonitor")
+    private let apiClient = APIClient()
+    private let database = DatabaseService.shared
+    
+    private init() {
+        startNetworkMonitoring()
+    }
+    
+    private func startNetworkMonitoring() {
+        monitor.pathUpdateHandler = { [weak self] path in
+            DispatchQueue.main.async {
+                self?.isOnline = path.status == .satisfied
+                if path.status == .satisfied {
+                    self?.syncPendingChanges()
+                }
+            }
+        }
+        monitor.start(queue: monitorQueue)
+    }
+    
+    func syncPendingChanges() async {
+        guard isOnline, !isSyncing else { return }
+        
+        isSyncing = true
+        
+        do {
+            let pending = try await database.fetchPendingSync()
+            
+            for item in pending {
+                do {
+                    try await processPendingItem(item)
+                    try await database.removePendingSync(id: item.id)
+                } catch {
+                    print("Failed to sync item \(item.id): \(error)")
+                }
+            }
+        } catch {
+            print("Failed to fetch pending sync: \(error)")
+        }
+        
+        isSyncing = false
+    }
+    
+    private func processPendingItem(_ item: (id: String, type: String, action: String, payload: String)) async throws {
+        let decoder = JSONDecoder()
+        let encoder = JSONEncoder()
+        
+        switch item.type {
+        case "timeEntry":
+            let data = item.payload.data(using: .utf8)!
+            
+            switch item.action {
+            case "create":
+                let input = try decoder.decode(CreateTimeEntryInput.self, from: data)
+                _ = try await apiClient.request(
+                    endpoint: APIEndpoint.timeEntries,
+                    method: .post,
+                    body: input,
+                    authenticated: true
+                )
+            case "update":
+                struct UpdateRequest: Codable {
+                    let id: String
+                    let input: UpdateTimeEntryInput
+                }
+                let request = try decoder.decode(UpdateRequest.self, from: data)
+                _ = try await apiClient.request(
+                    endpoint: APIEndpoint.timeEntry(id: request.id),
+                    method: .put,
+                    body: request.input,
+                    authenticated: true
+                )
+            case "delete":
+                _ = try await apiClient.requestVoid(
+                    endpoint: APIEndpoint.timeEntry(id: item.id),
+                    method: .delete,
+                    authenticated: true
+                )
+            default:
+                break
+            }
+        case "client":
+            let data = item.payload.data(using: .utf8)!
+            
+            switch item.action {
+            case "create":
+                let input = try decoder.decode(CreateClientInput.self, from: data)
+                _ = try await apiClient.request(
+                    endpoint: APIEndpoint.clients,
+                    method: .post,
+                    body: input,
+                    authenticated: true
+                )
+            case "update":
+                struct UpdateRequest: Codable {
+                    let id: String
+                    let input: UpdateClientInput
+                }
+                let request = try decoder.decode(UpdateRequest.self, from: data)
+                _ = try await apiClient.request(
+                    endpoint: APIEndpoint.client(id: request.id),
+                    method: .put,
+                    body: request.input,
+                    authenticated: true
+                )
+            case "delete":
+                _ = try await apiClient.requestVoid(
+                    endpoint: APIEndpoint.client(id: item.id),
+                    method: .delete,
+                    authenticated: true
+                )
+            default:
+                break
+            }
+        case "project":
+            let data = item.payload.data(using: .utf8)!
+            
+            switch item.action {
+            case "create":
+                let input = try decoder.decode(CreateProjectInput.self, from: data)
+                _ = try await apiClient.request(
+                    endpoint: APIEndpoint.projects,
+                    method: .post,
+                    body: input,
+                    authenticated: true
+                )
+            case "update":
+                struct UpdateRequest: Codable {
+                    let id: String
+                    let input: UpdateProjectInput
+                }
+                let request = try decoder.decode(UpdateRequest.self, from: data)
+                _ = try await apiClient.request(
+                    endpoint: APIEndpoint.project(id: request.id),
+                    method: .put,
+                    body: request.input,
+                    authenticated: true
+                )
+            case "delete":
+                _ = try await apiClient.requestVoid(
+                    endpoint: APIEndpoint.project(id: item.id),
+                    method: .delete,
+                    authenticated: true
+                )
+            default:
+                break
+            }
+        default:
+            break
+        }
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Features/Auth/LoginView.swift b/ios/TimeTracker/TimeTracker/Features/Auth/LoginView.swift
new file mode 100644
index 0000000..d3b4fc8
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Features/Auth/LoginView.swift
@@ -0,0 +1,87 @@
+import SwiftUI
+import AuthenticationServices
+
+struct LoginView: View {
+    @EnvironmentObject var authManager: AuthManager
+    @State private var isLoading = false
+    @State private var errorMessage: String?
+    
+    var body: some View {
+        VStack(spacing: 24) {
+            Spacer()
+            
+            Image(systemName: "timer")
+                .font(.system(size: 64))
+                .foregroundStyle(.accent)
+            
+            Text("TimeTracker")
+                .font(.largeTitle)
+                .fontWeight(.bold)
+            
+            Text("Track your time spent on projects")
+                .font(.subheadline)
+                .foregroundStyle(.secondary)
+            
+            Spacer()
+            
+            if let error = errorMessage {
+                Text(error)
+                    .font(.subheadline)
+                    .foregroundStyle(.red)
+                    .padding(.horizontal)
+            }
+            
+            Button {
+                login()
+            } label: {
+                if isLoading {
+                    ProgressView()
+                        .progressViewStyle(CircularProgressViewStyle(tint: .white))
+                        .frame(maxWidth: .infinity)
+                } else {
+                    Text("Sign In")
+                        .frame(maxWidth: .infinity)
+                }
+            }
+            .buttonStyle(.borderedProminent)
+            .controlSize(.large)
+            .disabled(isLoading)
+            .padding(.horizontal, 40)
+            
+            Spacer()
+                .frame(height: 40)
+        }
+        .padding()
+        .onReceive(NotificationCenter.default.publisher(for: .authCallbackReceived)) { notification in
+            handleAuthCallback(notification.userInfo)
+        }
+    }
+    
+    private func login() {
+        isLoading = true
+        errorMessage = nil
+        
+        Task {
+            do {
+                let authService = AuthService.shared
+                await authService.login(presentationAnchor: nil as! ASPresentationAnchor)
+            } catch {
+                await MainActor.run {
+                    isLoading = false
+                    errorMessage = error.localizedDescription
+                }
+            }
+        }
+    }
+    
+    private func handleAuthCallback(_ userInfo: [AnyHashable: Any]?) {
+        // Handle OAuth callback
+        // In practice, this would exchange the code for tokens
+        Task {
+            await authManager.checkAuthState()
+            await MainActor.run {
+                isLoading = false
+            }
+        }
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Features/Clients/ClientsView.swift b/ios/TimeTracker/TimeTracker/Features/Clients/ClientsView.swift
new file mode 100644
index 0000000..3eaedff
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Features/Clients/ClientsView.swift
@@ -0,0 +1,123 @@
+import SwiftUI
+
+struct ClientsView: View {
+    @StateObject private var viewModel = ClientsViewModel()
+    @State private var showAddClient = false
+    
+    var body: some View {
+        NavigationStack {
+            Group {
+                if viewModel.isLoading && viewModel.clients.isEmpty {
+                    LoadingView()
+                } else if let error = viewModel.error, viewModel.clients.isEmpty {
+                    ErrorView(message: error) {
+                        Task { await viewModel.loadClients() }
+                    }
+                } else if viewModel.clients.isEmpty {
+                    EmptyView(
+                        icon: "person.2",
+                        title: "No Clients",
+                        message: "Create a client to organize your projects."
+                    )
+                } else {
+                    clientsList
+                }
+            }
+            .navigationTitle("Clients")
+            .toolbar {
+                ToolbarItem(placement: .primaryAction) {
+                    Button {
+                        showAddClient = true
+                    } label: {
+                        Image(systemName: "plus")
+                    }
+                }
+            }
+            .task {
+                await viewModel.loadClients()
+            }
+            .sheet(isPresented: $showAddClient) {
+                ClientFormView(onSave: { name, description in
+                    Task {
+                        await viewModel.createClient(name: name, description: description)
+                    }
+                })
+            }
+        }
+    }
+    
+    private var clientsList: some View {
+        List {
+            ForEach(viewModel.clients) { client in
+                ClientRow(client: client)
+            }
+            .onDelete { indexSet in
+                Task {
+                    for index in indexSet {
+                        await viewModel.deleteClient(viewModel.clients[index])
+                    }
+                }
+            }
+        }
+        .refreshable {
+            await viewModel.loadClients()
+        }
+    }
+}
+
+struct ClientRow: View {
+    let client: Client
+    
+    var body: some View {
+        VStack(alignment: .leading, spacing: 4) {
+            Text(client.name)
+                .font(.headline)
+            if let description = client.description {
+                Text(description)
+                    .font(.subheadline)
+                    .foregroundStyle(.secondary)
+                    .lineLimit(2)
+            }
+        }
+    }
+}
+
+struct ClientFormView: View {
+    @Environment(\.dismiss) private var dismiss
+    
+    let onSave: (String, String?) -> Void
+    
+    @State private var name = ""
+    @State private var description = ""
+    
+    var body: some View {
+        NavigationStack {
+            Form {
+                Section("Name") {
+                    TextField("Client name", text: $name)
+                }
+                
+                Section("Description (Optional)") {
+                    TextField("Description", text: $description, axis: .vertical)
+                        .lineLimit(3...6)
+                }
+            }
+            .navigationTitle("New Client")
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .cancellationAction) {
+                    Button("Cancel") {
+                        dismiss()
+                    }
+                }
+                ToolbarItem(placement: .confirmationAction) {
+                    Button("Save") {
+                        onSave(name, description.isEmpty ? nil : description)
+                        dismiss()
+                    }
+                    .disabled(name.isEmpty)
+                }
+            }
+        }
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Features/Clients/ClientsViewModel.swift b/ios/TimeTracker/TimeTracker/Features/Clients/ClientsViewModel.swift
new file mode 100644
index 0000000..d8f7510
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Features/Clients/ClientsViewModel.swift
@@ -0,0 +1,87 @@
+import Foundation
+import SwiftUI
+
+@MainActor
+final class ClientsViewModel: ObservableObject {
+    @Published var clients: [Client] = []
+    @Published var isLoading = false
+    @Published var error: String?
+    
+    private let apiClient = APIClient()
+    private let database = DatabaseService.shared
+    
+    func loadClients() async {
+        isLoading = true
+        error = nil
+        
+        do {
+            let response: ClientListResponse = try await apiClient.request(
+                endpoint: APIEndpoint.clients,
+                authenticated: true
+            )
+            clients = response.clients
+            
+            try await database.saveClients(clients)
+            
+            isLoading = false
+        } catch {
+            isLoading = false
+            self.error = error.localizedDescription
+            
+            // Load from cache
+            clients = (try? await database.fetchClients()) ?? []
+        }
+    }
+    
+    func createClient(name: String, description: String?) async {
+        isLoading = true
+        
+        do {
+            let input = CreateClientInput(name: name, description: description)
+            _ = try await apiClient.request(
+                endpoint: APIEndpoint.clients,
+                method: .post,
+                body: input,
+                authenticated: true
+            )
+            
+            await loadClients()
+        } catch {
+            isLoading = false
+            self.error = error.localizedDescription
+        }
+    }
+    
+    func updateClient(id: String, name: String, description: String?) async {
+        isLoading = true
+        
+        do {
+            let input = UpdateClientInput(name: name, description: description)
+            _ = try await apiClient.request(
+                endpoint: APIEndpoint.client(id: id),
+                method: .put,
+                body: input,
+                authenticated: true
+            )
+            
+            await loadClients()
+        } catch {
+            isLoading = false
+            self.error = error.localizedDescription
+        }
+    }
+    
+    func deleteClient(_ client: Client) async {
+        do {
+            try await apiClient.requestVoid(
+                endpoint: APIEndpoint.client(id: client.id),
+                method: .delete,
+                authenticated: true
+            )
+            
+            clients.removeAll { $0.id == client.id }
+        } catch {
+            self.error = error.localizedDescription
+        }
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Features/Dashboard/DashboardView.swift b/ios/TimeTracker/TimeTracker/Features/Dashboard/DashboardView.swift
new file mode 100644
index 0000000..3ea5e63
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Features/Dashboard/DashboardView.swift
@@ -0,0 +1,165 @@
+import SwiftUI
+
+struct DashboardView: View {
+    @StateObject private var viewModel = DashboardViewModel()
+    
+    var body: some View {
+        NavigationStack {
+            ScrollView {
+                VStack(spacing: 24) {
+                    // Active Timer Card
+                    timerCard
+                    
+                    // Weekly Stats
+                    if let stats = viewModel.statistics {
+                        statsSection(stats)
+                    }
+                    
+                    // Recent Entries
+                    recentEntriesSection
+                }
+                .padding()
+            }
+            .navigationTitle("Dashboard")
+            .refreshable {
+                await viewModel.loadData()
+            }
+            .task {
+                await viewModel.loadData()
+            }
+        }
+    }
+    
+    private var timerCard: some View {
+        VStack(spacing: 16) {
+            if let timer = viewModel.activeTimer {
+                HStack {
+                    VStack(alignment: .leading, spacing: 4) {
+                        Text("Timer Running")
+                            .font(.subheadline)
+                            .foregroundStyle(.secondary)
+                        
+                        Text(viewModel.elapsedTime.formattedDuration)
+                            .font(.system(size: 32, weight: .medium, design: .monospaced))
+                        
+                        if let project = timer.project {
+                            ProjectColorBadge(color: project.color, name: project.name)
+                        }
+                    }
+                    
+                    Spacer()
+                    
+                    Image(systemName: "timer")
+                        .font(.title)
+                        .foregroundStyle(.green)
+                }
+            } else {
+                HStack {
+                    VStack(alignment: .leading, spacing: 4) {
+                        Text("No Active Timer")
+                            .font(.subheadline)
+                            .foregroundStyle(.secondary)
+                        
+                        Text("Start tracking to see your time")
+                            .font(.headline)
+                    }
+                    
+                    Spacer()
+                    
+                    Image(systemName: "timer")
+                        .font(.title)
+                        .foregroundStyle(.secondary)
+                }
+            }
+        }
+        .padding()
+        .background(Color(.systemGray6))
+        .cornerRadius(12)
+    }
+    
+    private func statsSection(_ stats: TimeStatistics) -> some View {
+        VStack(alignment: .leading, spacing: 12) {
+            Text("This Week")
+                .font(.headline)
+            
+            HStack(spacing: 12) {
+                StatCard(
+                    title: "Hours Tracked",
+                    value: TimeInterval(stats.totalSeconds).formattedHours,
+                    icon: "clock.fill",
+                    color: .blue
+                )
+                
+                StatCard(
+                    title: "Entries",
+                    value: "\(stats.entryCount)",
+                    icon: "list.bullet",
+                    color: .green
+                )
+            }
+            
+            if !stats.byProject.isEmpty {
+                VStack(alignment: .leading, spacing: 8) {
+                    Text("By Project")
+                        .font(.subheadline)
+                        .foregroundStyle(.secondary)
+                    
+                    ForEach(stats.byProject.prefix(5)) { projectStat in
+                        HStack {
+                            if let color = projectStat.projectColor {
+                                ProjectColorDot(color: color)
+                            }
+                            Text(projectStat.projectName)
+                                .font(.subheadline)
+                            Spacer()
+                            Text(TimeInterval(projectStat.totalSeconds).formattedHours)
+                                .font(.subheadline)
+                                .foregroundStyle(.secondary)
+                        }
+                    }
+                }
+            }
+        }
+    }
+    
+    private var recentEntriesSection: some View {
+        VStack(alignment: .leading, spacing: 12) {
+            Text("Recent Entries")
+                .font(.headline)
+            
+            if viewModel.recentEntries.isEmpty {
+                Text("No entries yet")
+                    .font(.subheadline)
+                    .foregroundStyle(.secondary)
+                    .frame(maxWidth: .infinity, alignment: .center)
+                    .padding()
+            } else {
+                ForEach(viewModel.recentEntries) { entry in
+                    HStack {
+                        ProjectColorDot(color: entry.project.color, size: 10)
+                        VStack(alignment: .leading, spacing: 2) {
+                            Text(entry.project.name)
+                                .font(.subheadline)
+                            Text(formatDate(entry.startTime))
+                                .font(.caption)
+                                .foregroundStyle(.secondary)
+                        }
+                        Spacer()
+                        Text(entry.duration.formattedHours)
+                            .font(.subheadline)
+                            .foregroundStyle(.secondary)
+                    }
+                    .padding(.vertical, 4)
+                }
+            }
+        }
+        .padding()
+        .background(Color(.systemGray6))
+        .cornerRadius(12)
+    }
+    
+    private func formatDate(_ isoString: String) -> String {
+        guard let date = Date.fromISO8601(isoString) else { return "" }
+        return date.formattedDateTime()
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Features/Dashboard/DashboardViewModel.swift b/ios/TimeTracker/TimeTracker/Features/Dashboard/DashboardViewModel.swift
new file mode 100644
index 0000000..e4dd3e7
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Features/Dashboard/DashboardViewModel.swift
@@ -0,0 +1,92 @@
+import Foundation
+import SwiftUI
+
+@MainActor
+final class DashboardViewModel: ObservableObject {
+    @Published var activeTimer: OngoingTimer?
+    @Published var statistics: TimeStatistics?
+    @Published var recentEntries: [TimeEntry] = []
+    @Published var isLoading = false
+    @Published var error: String?
+    @Published var elapsedTime: TimeInterval = 0
+    
+    private let apiClient = APIClient()
+    private let database = DatabaseService.shared
+    private var timerTask: Task<Void, Never>?
+    
+    init() {
+        startElapsedTimeUpdater()
+    }
+    
+    deinit {
+        timerTask?.cancel()
+    }
+    
+    func loadData() async {
+        isLoading = true
+        error = nil
+        
+        do {
+            // Fetch active timer
+            activeTimer = try await apiClient.request(
+                endpoint: APIEndpoint.timer,
+                authenticated: true
+            )
+            
+            // Get statistics for this week
+            let calendar = Calendar.current
+            let today = Date()
+            let startOfWeek = calendar.date(from: calendar.dateComponents([.yearForWeekOfYear, .weekOfYear], from: today))!
+            let endOfWeek = calendar.date(byAdding: .day, value: 6, to: startOfWeek)!
+            
+            let statsInput = StatisticsFiltersInput(startDate: startOfWeek, endDate: endOfWeek)
+            statistics = try await apiClient.request(
+                endpoint: APIEndpoint.timeEntriesStatistics,
+                queryItems: [
+                    URLQueryItem(name: "startDate", value: startOfWeek.iso8601FullDate),
+                    URLQueryItem(name: "endDate", value: endOfWeek.iso8601FullDate)
+                ],
+                authenticated: true
+            )
+            
+            // Fetch recent entries
+            let entriesResponse: TimeEntryListResponse = try await apiClient.request(
+                endpoint: APIEndpoint.timeEntries,
+                queryItems: [
+                    URLQueryItem(name: "limit", value: "5")
+                ],
+                authenticated: true
+            )
+            recentEntries = entriesResponse.entries
+            
+            if let timer = activeTimer {
+                elapsedTime = timer.elapsedTime
+            }
+            
+            isLoading = false
+        } catch {
+            isLoading = false
+            self.error = error.localizedDescription
+            
+            // Try to load cached data
+            if let cachedTimer = try? await database.getCachedTimer() {
+                activeTimer = cachedTimer
+                elapsedTime = cachedTimer.elapsedTime
+            }
+        }
+    }
+    
+    private func startElapsedTimeUpdater() {
+        timerTask = Task { [weak self] in
+            while !Task.isCancelled {
+                try? await Task.sleep(nanoseconds: 1_000_000_000)
+                
+                guard let self = self, self.activeTimer != nil else { continue }
+                
+                await MainActor.run {
+                    self.elapsedTime = self.activeTimer?.elapsedTime ?? 0
+                }
+            }
+        }
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Features/Projects/ProjectsView.swift b/ios/TimeTracker/TimeTracker/Features/Projects/ProjectsView.swift
new file mode 100644
index 0000000..37bdfac
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Features/Projects/ProjectsView.swift
@@ -0,0 +1,167 @@
+import SwiftUI
+
+struct ProjectsView: View {
+    @StateObject private var viewModel = ProjectsViewModel()
+    @State private var showAddProject = false
+    
+    var body: some View {
+        NavigationStack {
+            Group {
+                if viewModel.isLoading && viewModel.projects.isEmpty {
+                    LoadingView()
+                } else if let error = viewModel.error, viewModel.projects.isEmpty {
+                    ErrorView(message: error) {
+                        Task { await viewModel.loadData() }
+                    }
+                } else if viewModel.projects.isEmpty {
+                    EmptyView(
+                        icon: "folder",
+                        title: "No Projects",
+                        message: "Create a project to start tracking time."
+                    )
+                } else {
+                    projectsList
+                }
+            }
+            .navigationTitle("Projects")
+            .toolbar {
+                ToolbarItem(placement: .primaryAction) {
+                    Button {
+                        showAddProject = true
+                    } label: {
+                        Image(systemName: "plus")
+                    }
+                }
+            }
+            .task {
+                await viewModel.loadData()
+            }
+            .sheet(isPresented: $showAddProject) {
+                ProjectFormView(
+                    clients: viewModel.clients,
+                    onSave: { name, description, color, clientId in
+                        Task {
+                            await viewModel.createProject(
+                                name: name,
+                                description: description,
+                                color: color,
+                                clientId: clientId
+                            )
+                        }
+                    }
+                )
+            }
+        }
+    }
+    
+    private var projectsList: some View {
+        List {
+            ForEach(viewModel.projects) { project in
+                ProjectRow(project: project)
+            }
+            .onDelete { indexSet in
+                Task {
+                    for index in indexSet {
+                        await viewModel.deleteProject(viewModel.projects[index])
+                    }
+                }
+            }
+        }
+        .refreshable {
+            await viewModel.loadData()
+        }
+    }
+}
+
+struct ProjectRow: View {
+    let project: Project
+    
+    var body: some View {
+        HStack {
+            ProjectColorDot(color: project.color, size: 16)
+            
+            VStack(alignment: .leading, spacing: 2) {
+                Text(project.name)
+                    .font(.headline)
+                Text(project.client.name)
+                    .font(.subheadline)
+                    .foregroundStyle(.secondary)
+            }
+        }
+    }
+}
+
+struct ProjectFormView: View {
+    @Environment(\.dismiss) private var dismiss
+    
+    let clients: [Client]
+    let onSave: (String, String?, String?, String) -> Void
+    
+    @State private var name = ""
+    @State private var description = ""
+    @State private var selectedColor: String = "#3B82F6"
+    @State private var selectedClient: Client?
+    
+    private let colors = ["#EF4444", "#F97316", "#EAB308", "#22C55E", "#14B8A6", 
+                          "#06B6D4", "#3B82F6", "#6366F1", "#A855F7", "#EC4899"]
+    
+    var body: some View {
+        NavigationStack {
+            Form {
+                Section("Name") {
+                    TextField("Project name", text: $name)
+                }
+                
+                Section("Description (Optional)") {
+                    TextField("Description", text: $description, axis: .vertical)
+                        .lineLimit(3...6)
+                }
+                
+                Section("Color") {
+                    LazyVGrid(columns: Array(repeating: GridItem(.flexible()), count: 5), spacing: 16) {
+                        ForEach(colors, id: \.self) { color in
+                            Circle()
+                                .fill(Color(hex: color))
+                                .frame(width: 44, height: 44)
+                                .overlay(
+                                    Circle()
+                                        .strokeBorder(Color.primary, lineWidth: selectedColor == color ? 3 : 0)
+                                )
+                                .onTapGesture {
+                                    selectedColor = color
+                                }
+                        }
+                    }
+                    .padding(.vertical, 8)
+                }
+                
+                Section("Client") {
+                    Picker("Client", selection: $selectedClient) {
+                        Text("Select Client").tag(nil as Client?)
+                        ForEach(clients) { client in
+                            Text(client.name)
+                                .tag(client as Client?)
+                        }
+                    }
+                }
+            }
+            .navigationTitle("New Project")
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .cancellationAction) {
+                    Button("Cancel") {
+                        dismiss()
+                    }
+                }
+                ToolbarItem(placement: .confirmationAction) {
+                    Button("Save") {
+                        guard let client = selectedClient else { return }
+                        onSave(name, description.isEmpty ? nil : description, selectedColor, client.id)
+                        dismiss()
+                    }
+                    .disabled(name.isEmpty || selectedClient == nil)
+                }
+            }
+        }
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Features/Projects/ProjectsViewModel.swift b/ios/TimeTracker/TimeTracker/Features/Projects/ProjectsViewModel.swift
new file mode 100644
index 0000000..cf59d55
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Features/Projects/ProjectsViewModel.swift
@@ -0,0 +1,104 @@
+import Foundation
+import SwiftUI
+
+@MainActor
+final class ProjectsViewModel: ObservableObject {
+    @Published var projects: [Project] = []
+    @Published var clients: [Client] = []
+    @Published var isLoading = false
+    @Published var error: String?
+    
+    private let apiClient = APIClient()
+    private let database = DatabaseService.shared
+    
+    func loadData() async {
+        isLoading = true
+        error = nil
+        
+        do {
+            let clientsResponse: ClientListResponse = try await apiClient.request(
+                endpoint: APIEndpoint.clients,
+                authenticated: true
+            )
+            clients = clientsResponse.clients
+            
+            let projectsResponse: ProjectListResponse = try await apiClient.request(
+                endpoint: APIEndpoint.projects,
+                authenticated: true
+            )
+            projects = projectsResponse.projects
+            
+            try await database.saveProjects(projects)
+            
+            isLoading = false
+        } catch {
+            isLoading = false
+            self.error = error.localizedDescription
+            
+            // Load from cache
+            projects = (try? await database.fetchProjects()) ?? []
+        }
+    }
+    
+    func createProject(name: String, description: String?, color: String?, clientId: String) async {
+        isLoading = true
+        
+        do {
+            let input = CreateProjectInput(
+                name: name,
+                description: description,
+                color: color,
+                clientId: clientId
+            )
+            _ = try await apiClient.request(
+                endpoint: APIEndpoint.projects,
+                method: .post,
+                body: input,
+                authenticated: true
+            )
+            
+            await loadData()
+        } catch {
+            isLoading = false
+            self.error = error.localizedDescription
+        }
+    }
+    
+    func updateProject(id: String, name: String, description: String?, color: String?, clientId: String) async {
+        isLoading = true
+        
+        do {
+            let input = UpdateProjectInput(
+                name: name,
+                description: description,
+                color: color,
+                clientId: clientId
+            )
+            _ = try await apiClient.request(
+                endpoint: APIEndpoint.project(id: id),
+                method: .put,
+                body: input,
+                authenticated: true
+            )
+            
+            await loadData()
+        } catch {
+            isLoading = false
+            self.error = error.localizedDescription
+        }
+    }
+    
+    func deleteProject(_ project: Project) async {
+        do {
+            try await apiClient.requestVoid(
+                endpoint: APIEndpoint.project(id: project.id),
+                method: .delete,
+                authenticated: true
+            )
+            
+            projects.removeAll { $0.id == project.id }
+        } catch {
+            self.error = error.localizedDescription
+        }
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Features/TimeEntries/TimeEntriesView.swift b/ios/TimeTracker/TimeTracker/Features/TimeEntries/TimeEntriesView.swift
new file mode 100644
index 0000000..56623e5
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Features/TimeEntries/TimeEntriesView.swift
@@ -0,0 +1,112 @@
+import SwiftUI
+
+struct TimeEntriesView: View {
+    @StateObject private var viewModel = TimeEntriesViewModel()
+    @State private var showAddEntry = false
+    
+    var body: some View {
+        NavigationStack {
+            Group {
+                if viewModel.isLoading && viewModel.entries.isEmpty {
+                    LoadingView()
+                } else if let error = viewModel.error, viewModel.entries.isEmpty {
+                    ErrorView(message: error) {
+                        Task { await viewModel.loadEntries() }
+                    }
+                } else if viewModel.entries.isEmpty {
+                    EmptyView(
+                        icon: "clock",
+                        title: "No Time Entries",
+                        message: "Start tracking your time to see entries here."
+                    )
+                } else {
+                    entriesList
+                }
+            }
+            .navigationTitle("Time Entries")
+            .toolbar {
+                ToolbarItem(placement: .primaryAction) {
+                    Button {
+                        showAddEntry = true
+                    } label: {
+                        Image(systemName: "plus")
+                    }
+                }
+            }
+            .task {
+                await viewModel.loadEntries()
+            }
+            .sheet(isPresented: $showAddEntry) {
+                TimeEntryFormView(onSave: {
+                    Task { await viewModel.loadEntries() }
+                })
+            }
+        }
+    }
+    
+    private var entriesList: some View {
+        List {
+            ForEach(viewModel.entries) { entry in
+                TimeEntryRow(entry: entry)
+            }
+            .onDelete { indexSet in
+                Task {
+                    for index in indexSet {
+                        await viewModel.deleteEntry(viewModel.entries[index])
+                    }
+                }
+            }
+        }
+        .refreshable {
+            await viewModel.loadEntries()
+        }
+    }
+}
+
+struct TimeEntryRow: View {
+    let entry: TimeEntry
+    
+    var body: some View {
+        VStack(alignment: .leading, spacing: 8) {
+            HStack {
+                ProjectColorDot(color: entry.project.color)
+                Text(entry.project.name)
+                    .font(.headline)
+                Spacer()
+                Text(entry.duration.formattedHours)
+                    .font(.subheadline)
+                    .foregroundStyle(.secondary)
+            }
+            
+            HStack {
+                Text(formatDateRange(entry.startTime, entry.endTime))
+                    .font(.subheadline)
+                    .foregroundStyle(.secondary)
+                Spacer()
+                Text(entry.project.client.name)
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+            }
+            
+            if let description = entry.description {
+                Text(description)
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+                    .lineLimit(2)
+            }
+        }
+        .padding(.vertical, 4)
+    }
+    
+    private func formatDateRange(start: String, end: String) -> String {
+        let formatter = DateFormatter()
+        formatter.dateFormat = "MMM d, HH:mm"
+        
+        guard let startDate = Date.fromISO8601(start),
+              let endDate = Date.fromISO8601(end) else {
+            return ""
+        }
+        
+        return "\(formatter.string(from: startDate)) - \(formatter.string(from: endDate))"
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Features/TimeEntries/TimeEntriesViewModel.swift b/ios/TimeTracker/TimeTracker/Features/TimeEntries/TimeEntriesViewModel.swift
new file mode 100644
index 0000000..cac652a
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Features/TimeEntries/TimeEntriesViewModel.swift
@@ -0,0 +1,81 @@
+import Foundation
+import SwiftUI
+
+@MainActor
+final class TimeEntriesViewModel: ObservableObject {
+    @Published var entries: [TimeEntry] = []
+    @Published var pagination: Pagination?
+    @Published var isLoading = false
+    @Published var error: String?
+    @Published var filters = TimeEntryFilters()
+    
+    private let apiClient = APIClient()
+    
+    func loadEntries() async {
+        isLoading = true
+        error = nil
+        
+        do {
+            var queryItems: [URLQueryItem] = []
+            
+            if let startDate = filters.startDate {
+                queryItems.append(URLQueryItem(name: "startDate", value: startDate))
+            }
+            if let endDate = filters.endDate {
+                queryItems.append(URLQueryItem(name: "endDate", value: endDate))
+            }
+            if let projectId = filters.projectId {
+                queryItems.append(URLQueryItem(name: "projectId", value: projectId))
+            }
+            if let page = filters.page {
+                queryItems.append(URLQueryItem(name: "page", value: String(page)))
+            }
+            if let limit = filters.limit {
+                queryItems.append(URLQueryItem(name: "limit", value: String(limit)))
+            }
+            
+            let response: TimeEntryListResponse = try await apiClient.request(
+                endpoint: APIEndpoint.timeEntries,
+                queryItems: queryItems.isEmpty ? nil : queryItems,
+                authenticated: true
+            )
+            
+            entries = response.entries
+            pagination = response.pagination
+            isLoading = false
+        } catch {
+            isLoading = false
+            self.error = error.localizedDescription
+        }
+    }
+    
+    func nextPage() async {
+        guard let pagination = pagination,
+              pagination.page < pagination.totalPages else { return }
+        
+        filters.page = pagination.page + 1
+        await loadEntries()
+    }
+    
+    func previousPage() async {
+        guard let pagination = pagination,
+              pagination.page > 1 else { return }
+        
+        filters.page = pagination.page - 1
+        await loadEntries()
+    }
+    
+    func deleteEntry(_ entry: TimeEntry) async {
+        do {
+            try await apiClient.requestVoid(
+                endpoint: APIEndpoint.timeEntry(id: entry.id),
+                method: .delete,
+                authenticated: true
+            )
+            
+            entries.removeAll { $0.id == entry.id }
+        } catch {
+            self.error = error.localizedDescription
+        }
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Features/TimeEntries/TimeEntryFormView.swift b/ios/TimeTracker/TimeTracker/Features/TimeEntries/TimeEntryFormView.swift
new file mode 100644
index 0000000..81394ca
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Features/TimeEntries/TimeEntryFormView.swift
@@ -0,0 +1,171 @@
+import SwiftUI
+
+struct TimeEntryFormView: View {
+    @Environment(\.dismiss) private var dismiss
+    
+    let entry: TimeEntry?
+    let onSave: () -> Void
+    
+    @State private var startDate = Date()
+    @State private var startTime = Date()
+    @State private var endDate = Date()
+    @State private var endTime = Date()
+    @State private var description = ""
+    @State private var selectedProject: Project?
+    @State private var projects: [Project] = []
+    @State private var isLoading = false
+    @State private var error: String?
+    
+    private let apiClient = APIClient()
+    
+    init(entry: TimeEntry? = nil, onSave: @escaping () -> Void) {
+        self.entry = entry
+        self.onSave = onSave
+    }
+    
+    var body: some View {
+        NavigationStack {
+            Form {
+                Section("Project") {
+                    Picker("Project", selection: $selectedProject) {
+                        Text("Select Project").tag(nil as Project?)
+                        ForEach(projects) { project in
+                            HStack {
+                                ProjectColorDot(color: project.color)
+                                Text(project.name)
+                            }
+                            .tag(project as Project?)
+                        }
+                    }
+                }
+                
+                Section("Start Time") {
+                    DatePicker("Date", selection: $startDate, displayedComponents: .date)
+                    DatePicker("Time", selection: $startTime, displayedComponents: .hourAndMinute)
+                }
+                
+                Section("End Time") {
+                    DatePicker("Date", selection: $endDate, displayedComponents: .date)
+                    DatePicker("Time", selection: $endTime, displayedComponents: .hourAndMinute)
+                }
+                
+                Section("Description (Optional)") {
+                    TextField("Description", text: $description, axis: .vertical)
+                        .lineLimit(3...6)
+                }
+            }
+            .navigationTitle(entry == nil ? "New Entry" : "Edit Entry")
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .cancellationAction) {
+                    Button("Cancel") {
+                        dismiss()
+                    }
+                }
+                ToolbarItem(placement: .confirmationAction) {
+                    Button("Save") {
+                        save()
+                    }
+                    .disabled(selectedProject == nil || isLoading)
+                }
+            }
+            .task {
+                await loadProjects()
+                if let entry = entry {
+                    await loadEntry(entry)
+                }
+            }
+        }
+    }
+    
+    private func loadProjects() async {
+        do {
+            let response: ProjectListResponse = try await apiClient.request(
+                endpoint: APIEndpoint.projects,
+                authenticated: true
+            )
+            projects = response.projects
+        } catch {
+            self.error = error.localizedDescription
+        }
+    }
+    
+    private func loadEntry(_ entry: TimeEntry) async {
+        let startFormatter = DateFormatter()
+        startFormatter.dateFormat = "yyyy-MM-dd"
+        let timeFormatter = DateFormatter()
+        timeFormatter.dateFormat = "HH:mm"
+        
+        if let startDateObj = Date.fromISO8601(entry.startTime) {
+            startDate = startDateObj
+            startTime = startDateObj
+        }
+        
+        if let endDateObj = Date.fromISO8601(entry.endTime) {
+            endDate = endDateObj
+            endTime = endDateObj
+        }
+        
+        description = entry.description ?? ""
+        selectedProject = projects.first { $0.id == entry.projectId }
+    }
+    
+    private func save() {
+        guard let project = selectedProject else { return }
+        
+        isLoading = true
+        
+        let calendar = Calendar.current
+        let startDateTime = calendar.date(bySettingHour: calendar.component(.hour, from: startTime),
+                                         minute: calendar.component(.minute, from: startTime),
+                                         second: 0,
+                                         on: startDate) ?? startDate
+        let endDateTime = calendar.date(bySettingHour: calendar.component(.hour, from: endTime),
+                                        minute: calendar.component(.minute, from: endTime),
+                                        second: 0,
+                                        on: endDate) ?? endDate
+        
+        Task {
+            do {
+                if let existingEntry = entry {
+                    let input = UpdateTimeEntryInput(
+                        startTime: startDateTime.iso8601String,
+                        endTime: endDateTime.iso8601String,
+                        description: description.isEmpty ? nil : description,
+                        projectId: project.id
+                    )
+                    _ = try await apiClient.request(
+                        endpoint: APIEndpoint.timeEntry(id: existingEntry.id),
+                        method: .put,
+                        body: input,
+                        authenticated: true
+                    )
+                } else {
+                    let input = CreateTimeEntryInput(
+                        startTime: startDateTime,
+                        endTime: endDateTime,
+                        description: description.isEmpty ? nil : description,
+                        projectId: project.id
+                    )
+                    _ = try await apiClient.request(
+                        endpoint: APIEndpoint.timeEntries,
+                        method: .post,
+                        body: input,
+                        authenticated: true
+                    )
+                }
+                
+                await MainActor.run {
+                    isLoading = false
+                    dismiss()
+                    onSave()
+                }
+            } catch {
+                await MainActor.run {
+                    isLoading = false
+                    error = error.localizedDescription
+                }
+            }
+        }
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Features/Timer/TimerView.swift b/ios/TimeTracker/TimeTracker/Features/Timer/TimerView.swift
new file mode 100644
index 0000000..a00b469
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Features/Timer/TimerView.swift
@@ -0,0 +1,175 @@
+import SwiftUI
+
+struct TimerView: View {
+    @StateObject private var viewModel = TimerViewModel()
+    @State private var showProjectPicker = false
+    
+    var body: some View {
+        NavigationStack {
+            Group {
+                if viewModel.isLoading && viewModel.activeTimer == nil {
+                    LoadingView()
+                } else if let error = viewModel.error, viewModel.activeTimer == nil {
+                    ErrorView(message: error) {
+                        Task { await viewModel.loadData() }
+                    }
+                } else {
+                    timerContent
+                }
+            }
+            .navigationTitle("Timer")
+            .task {
+                await viewModel.loadData()
+            }
+            .sheet(isPresented: $showProjectPicker) {
+                ProjectPickerSheet(
+                    projects: viewModel.projects,
+                    selectedProject: viewModel.selectedProject
+                ) { project in
+                    Task {
+                        await viewModel.updateProject(project)
+                    }
+                }
+            }
+        }
+    }
+    
+    private var timerContent: some View {
+        VStack(spacing: 32) {
+            Spacer()
+            
+            // Timer Display
+            VStack(spacing: 8) {
+                Text(viewModel.elapsedTime.formattedDuration)
+                    .font(.system(size: 64, weight: .light, design: .monospaced))
+                    .foregroundStyle(viewModel.activeTimer != nil ? .primary : .secondary)
+                
+                if let project = viewModel.selectedProject ?? viewModel.activeTimer?.project {
+                    ProjectColorBadge(
+                        color: project.color,
+                        name: project.name
+                    )
+                } else {
+                    Text("No project selected")
+                        .font(.subheadline)
+                        .foregroundStyle(.secondary)
+                }
+            }
+            
+            Spacer()
+            
+            // Controls
+            VStack(spacing: 16) {
+                if viewModel.activeTimer == nil {
+                    Button {
+                        showProjectPicker = true
+                    } label: {
+                        HStack {
+                            Image(systemName: "folder")
+                            Text(viewModel.selectedProject?.name ?? "Select Project")
+                        }
+                        .frame(maxWidth: .infinity)
+                    }
+                    .buttonStyle(.bordered)
+                    .controlSize(.large)
+                    
+                    Button {
+                        Task { await viewModel.startTimer() }
+                    } label: {
+                        HStack {
+                            Image(systemName: "play.fill")
+                            Text("Start Timer")
+                        }
+                        .frame(maxWidth: .infinity)
+                    }
+                    .buttonStyle(.borderedProminent)
+                    .controlSize(.large)
+                } else {
+                    Button {
+                        showProjectPicker = true
+                    } label: {
+                        HStack {
+                            Image(systemName: "folder")
+                            Text("Change Project")
+                        }
+                        .frame(maxWidth: .infinity)
+                    }
+                    .buttonStyle(.bordered)
+                    .controlSize(.large)
+                    
+                    Button {
+                        Task { await viewModel.stopTimer() }
+                    } label: {
+                        HStack {
+                            Image(systemName: "stop.fill")
+                            Text("Stop Timer")
+                        }
+                        .frame(maxWidth: .infinity)
+                    }
+                    .buttonStyle(.borderedProminent)
+                    .tint(.red)
+                    .controlSize(.large)
+                }
+            }
+            .padding(.horizontal, 24)
+            
+            Spacer()
+        }
+    }
+}
+
+struct ProjectPickerSheet: View {
+    let projects: [Project]
+    let selectedProject: Project?
+    let onSelect: (Project?) -> Void
+    
+    @Environment(\.dismiss) private var dismiss
+    
+    var body: some View {
+        NavigationStack {
+            List {
+                Button {
+                    onSelect(nil)
+                    dismiss()
+                } label: {
+                    HStack {
+                        Text("No Project")
+                            .foregroundStyle(.primary)
+                        if selectedProject == nil {
+                            Image(systemName: "checkmark")
+                                .foregroundStyle(.accent)
+                        }
+                    }
+                }
+                
+                ForEach(projects) { project in
+                    Button {
+                        onSelect(project)
+                        dismiss()
+                    } label: {
+                        HStack {
+                            ProjectColorDot(color: project.color)
+                            Text(project.name)
+                                .foregroundStyle(.primary)
+                            Text(project.client.name)
+                                .foregroundStyle(.secondary)
+                            if selectedProject?.id == project.id {
+                                Image(systemName: "checkmark")
+                                    .foregroundStyle(.accent)
+                            }
+                        }
+                    }
+                }
+            }
+            .navigationTitle("Select Project")
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .cancellationAction) {
+                    Button("Cancel") {
+                        dismiss()
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Features/Timer/TimerViewModel.swift b/ios/TimeTracker/TimeTracker/Features/Timer/TimerViewModel.swift
new file mode 100644
index 0000000..f2bcc93
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Features/Timer/TimerViewModel.swift
@@ -0,0 +1,160 @@
+import Foundation
+import SwiftUI
+
+@MainActor
+final class TimerViewModel: ObservableObject {
+    @Published var activeTimer: OngoingTimer?
+    @Published var projects: [Project] = []
+    @Published var selectedProject: Project?
+    @Published var isLoading = false
+    @Published var error: String?
+    @Published var elapsedTime: TimeInterval = 0
+    
+    private let apiClient = APIClient()
+    private let database = DatabaseService.shared
+    private var timerTask: Task<Void, Never>?
+    
+    init() {
+        startElapsedTimeUpdater()
+    }
+    
+    deinit {
+        timerTask?.cancel()
+    }
+    
+    func loadData() async {
+        isLoading = true
+        error = nil
+        
+        do {
+            // Fetch active timer
+            activeTimer = try await apiClient.request(
+                endpoint: APIEndpoint.timer,
+                authenticated: true
+            )
+            
+            // Cache timer for widget
+            try await database.cacheTimer(activeTimer)
+            
+            // Fetch projects
+            let response: ProjectListResponse = try await apiClient.request(
+                endpoint: APIEndpoint.projects,
+                authenticated: true
+            )
+            projects = response.projects
+            
+            // Set selected project if timer has one
+            if let timerProject = activeTimer?.project {
+                selectedProject = projects.first { $0.id == timerProject.id }
+            }
+            
+            // Calculate elapsed time
+            if let timer = activeTimer {
+                elapsedTime = timer.elapsedTime
+            }
+            
+            isLoading = false
+        } catch {
+            isLoading = false
+            self.error = error.localizedDescription
+            
+            // Try to load cached data
+            if let cachedTimer = try? await database.getCachedTimer() {
+                activeTimer = cachedTimer
+                elapsedTime = cachedTimer.elapsedTime
+            }
+        }
+    }
+    
+    func startTimer() async {
+        isLoading = true
+        error = nil
+        
+        do {
+            let input = StartTimerInput(projectId: selectedProject?.id)
+            activeTimer = try await apiClient.request(
+                endpoint: APIEndpoint.timerStart,
+                method: .post,
+                body: input,
+                authenticated: true
+            )
+            
+            try await database.cacheTimer(activeTimer)
+            
+            if let timer = activeTimer {
+                elapsedTime = timer.elapsedTime
+            }
+            
+            isLoading = false
+        } catch {
+            isLoading = false
+            self.error = error.localizedDescription
+        }
+    }
+    
+    func stopTimer() async {
+        guard let timer = activeTimer else { return }
+        
+        isLoading = true
+        error = nil
+        
+        let projectId = selectedProject?.id ?? timer.projectId ?? ""
+        
+        do {
+            let input = StopTimerInput(projectId: projectId)
+            _ = try await apiClient.request(
+                endpoint: APIEndpoint.timerStop,
+                method: .post,
+                body: input,
+                authenticated: true
+            )
+            
+            activeTimer = nil
+            selectedProject = nil
+            elapsedTime = 0
+            
+            try await database.cacheTimer(nil)
+            
+            isLoading = false
+        } catch {
+            isLoading = false
+            self.error = error.localizedDescription
+        }
+    }
+    
+    func updateProject(_ project: Project?) async {
+        selectedProject = project
+        
+        guard let timer = activeTimer else { return }
+        
+        do {
+            guard let projectId = project?.id else { return }
+            
+            let input = UpdateTimerInput(projectId: projectId)
+            activeTimer = try await apiClient.request(
+                endpoint: APIEndpoint.timer,
+                method: .put,
+                body: input,
+                authenticated: true
+            )
+            
+            try await database.cacheTimer(activeTimer)
+        } catch {
+            self.error = error.localizedDescription
+        }
+    }
+    
+    private func startElapsedTimeUpdater() {
+        timerTask = Task { [weak self] in
+            while !Task.isCancelled {
+                try? await Task.sleep(nanoseconds: 1_000_000_000)
+                
+                guard let self = self, self.activeTimer != nil else { continue }
+                
+                await MainActor.run {
+                    self.elapsedTime = self.activeTimer?.elapsedTime ?? 0
+                }
+            }
+        }
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Info.plist b/ios/TimeTracker/TimeTracker/Info.plist
new file mode 100644
index 0000000..8105d63
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Info.plist
@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>CFBundleDevelopmentRegion</key>
+    <string>$(DEVELOPMENT_LANGUAGE)</string>
+    <key>CFBundleExecutable</key>
+    <string>$(EXECUTABLE_NAME)</string>
+    <key>CFBundleIdentifier</key>
+    <string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+    <key>CFBundleInfoDictionaryVersion</key>
+    <string>6.0</string>
+    <key>CFBundleName</key>
+    <string>$(PRODUCT_NAME)</string>
+    <key>CFBundlePackageType</key>
+    <string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+    <key>CFBundleShortVersionString</key>
+    <string>$(MARKETING_VERSION)</string>
+    <key>CFBundleVersion</key>
+    <string>$(CURRENT_PROJECT_VERSION)</string>
+    <key>LSRequiresIPhoneOS</key>
+    <true/>
+    <key>UIApplicationSceneManifest</key>
+    <dict>
+        <key>UIApplicationSupportsMultipleScenes</key>
+        <false/>
+    </dict>
+    <key>UILaunchScreen</key>
+    <dict>
+        <key>UIColorName</key>
+        <string>LaunchBackground</string>
+    </dict>
+    <key>UIRequiredDeviceCapabilities</key>
+    <array>
+        <string>armv7</string>
+    </array>
+    <key>UISupportedInterfaceOrientations</key>
+    <array>
+        <string>UIInterfaceOrientationPortrait</string>
+        <string>UIInterfaceOrientationLandscapeLeft</string>
+        <string>UIInterfaceOrientationLandscapeRight</string>
+    </array>
+    <key>UISupportedInterfaceOrientations~ipad</key>
+    <array>
+        <string>UIInterfaceOrientationPortrait</string>
+        <string>UIInterfaceOrientationPortraitUpsideDown</string>
+        <string>UIInterfaceOrientationLandscapeLeft</string>
+        <string>UIInterfaceOrientationLandscapeRight</string>
+    </array>
+    <key>CFBundleURLTypes</key>
+    <array>
+        <dict>
+            <key>CFBundleTypeRole</key>
+            <string>Editor</string>
+            <key>CFBundleURLName</key>
+            <string>com.timetracker.app</string>
+            <key>CFBundleURLSchemes</key>
+            <array>
+                <string>timetracker</string>
+            </array>
+        </dict>
+    </array>
+    <key>API_BASE_URL</key>
+    <string>$(API_BASE_URL)</string>
+</dict>
+</plist>
diff --git a/ios/TimeTracker/TimeTracker/Models/Client.swift b/ios/TimeTracker/TimeTracker/Models/Client.swift
new file mode 100644
index 0000000..9d683ba
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Models/Client.swift
@@ -0,0 +1,23 @@
+import Foundation
+
+struct Client: Codable, Identifiable, Equatable {
+    let id: String
+    let name: String
+    let description: String?
+    let createdAt: String
+    let updatedAt: String
+}
+
+struct ClientListResponse: Codable {
+    let clients: [Client]
+}
+
+struct CreateClientInput: Codable {
+    let name: String
+    let description: String?
+}
+
+struct UpdateClientInput: Codable {
+    let name: String?
+    let description: String?
+}
diff --git a/ios/TimeTracker/TimeTracker/Models/OngoingTimer.swift b/ios/TimeTracker/TimeTracker/Models/OngoingTimer.swift
new file mode 100644
index 0000000..f4b8714
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Models/OngoingTimer.swift
@@ -0,0 +1,41 @@
+import Foundation
+
+struct OngoingTimer: Codable, Identifiable, Equatable {
+    let id: String
+    let startTime: String
+    let projectId: String?
+    let project: ProjectReference?
+    let createdAt: String
+    let updatedAt: String
+    
+    var elapsedTime: TimeInterval {
+        guard let start = ISO8601DateFormatter().date(from: startTime) else {
+            return 0
+        }
+        return Date().timeIntervalSince(start)
+    }
+}
+
+struct StartTimerInput: Codable {
+    let projectId: String?
+    
+    init(projectId: String? = nil) {
+        self.projectId = projectId
+    }
+}
+
+struct UpdateTimerInput: Codable {
+    let projectId: String
+    
+    init(projectId: String) {
+        self.projectId = projectId
+    }
+}
+
+struct StopTimerInput: Codable {
+    let projectId: String
+    
+    init(projectId: String) {
+        self.projectId = projectId
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Models/Project.swift b/ios/TimeTracker/TimeTracker/Models/Project.swift
new file mode 100644
index 0000000..4079baf
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Models/Project.swift
@@ -0,0 +1,35 @@
+import Foundation
+
+struct Project: Codable, Identifiable, Equatable {
+    let id: String
+    let name: String
+    let description: String?
+    let color: String?
+    let clientId: String
+    let client: ClientReference
+    let createdAt: String
+    let updatedAt: String
+}
+
+struct ClientReference: Codable, Equatable {
+    let id: String
+    let name: String
+}
+
+struct ProjectListResponse: Codable {
+    let projects: [Project]
+}
+
+struct CreateProjectInput: Codable {
+    let name: String
+    let description: String?
+    let color: String?
+    let clientId: String
+}
+
+struct UpdateProjectInput: Codable {
+    let name: String?
+    let description: String?
+    let color: String?
+    let clientId: String?
+}
diff --git a/ios/TimeTracker/TimeTracker/Models/TimeEntry.swift b/ios/TimeTracker/TimeTracker/Models/TimeEntry.swift
new file mode 100644
index 0000000..bf553f5
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Models/TimeEntry.swift
@@ -0,0 +1,91 @@
+import Foundation
+
+struct TimeEntry: Codable, Identifiable, Equatable {
+    let id: String
+    let startTime: String
+    let endTime: String
+    let description: String?
+    let projectId: String
+    let project: ProjectReference
+    let createdAt: String
+    let updatedAt: String
+    
+    var duration: TimeInterval {
+        guard let start = ISO8601DateFormatter().date(from: startTime),
+              let end = ISO8601DateFormatter().date(from: endTime) else {
+            return 0
+        }
+        return end.timeIntervalSince(start)
+    }
+}
+
+struct ProjectReference: Codable, Equatable {
+    let id: String
+    let name: String
+    let color: String?
+    let client: ClientReference
+}
+
+struct TimeEntryListResponse: Codable {
+    let entries: [TimeEntry]
+    let pagination: Pagination
+}
+
+struct Pagination: Codable, Equatable {
+    let page: Int
+    let limit: Int
+    let total: Int
+    let totalPages: Int
+}
+
+struct TimeEntryFilters: Codable {
+    let startDate: String?
+    let endDate: String?
+    let projectId: String?
+    let clientId: String?
+    let page: Int?
+    let limit: Int?
+    
+    init(
+        startDate: Date? = nil,
+        endDate: Date? = nil,
+        projectId: String? = nil,
+        clientId: String? = nil,
+        page: Int = 1,
+        limit: Int = 20
+    ) {
+        let formatter = ISO8601DateFormatter()
+        formatter.formatOptions = [.withFullDate]
+        
+        self.startDate = startDate.map { formatter.string(from: $0) }
+        self.endDate = endDate.map { formatter.string(from: $0) }
+        self.projectId = projectId
+        self.clientId = clientId
+        self.page = page
+        self.limit = limit
+    }
+}
+
+struct CreateTimeEntryInput: Codable {
+    let startTime: String
+    let endTime: String
+    let description: String?
+    let projectId: String
+    
+    init(startTime: Date, endTime: Date, description: String? = nil, projectId: String) {
+        let formatter = ISO8601DateFormatter()
+        formatter.formatOptions = [.withInternetDateTime]
+        
+        self.startTime = formatter.string(from: startTime)
+        self.endTime = formatter.string(from: endTime)
+        self.description = description
+        self.projectId = projectId
+    }
+}
+
+struct UpdateTimeEntryInput: Codable {
+    let startTime: String?
+    let endTime: String?
+    let description: String?
+    let projectId: String?
+}
diff --git a/ios/TimeTracker/TimeTracker/Models/TimeStatistics.swift b/ios/TimeTracker/TimeTracker/Models/TimeStatistics.swift
new file mode 100644
index 0000000..c63cf4c
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Models/TimeStatistics.swift
@@ -0,0 +1,57 @@
+import Foundation
+
+struct TimeStatistics: Codable, Equatable {
+    let totalSeconds: Int
+    let entryCount: Int
+    let byProject: [ProjectStatistics]
+    let byClient: [ClientStatistics]
+    let filters: StatisticsFilters
+}
+
+struct ProjectStatistics: Codable, Identifiable, Equatable {
+    let projectId: String
+    let projectName: String
+    let projectColor: String?
+    let totalSeconds: Int
+    let entryCount: Int
+    
+    var id: String { projectId }
+}
+
+struct ClientStatistics: Codable, Identifiable, Equatable {
+    let clientId: String
+    let clientName: String
+    let totalSeconds: Int
+    let entryCount: Int
+    
+    var id: String { clientId }
+}
+
+struct StatisticsFilters: Codable, Equatable {
+    let startDate: String?
+    let endDate: String?
+    let projectId: String?
+    let clientId: String?
+}
+
+struct StatisticsFiltersInput: Codable {
+    let startDate: String?
+    let endDate: String?
+    let projectId: String?
+    let clientId: String?
+    
+    init(
+        startDate: Date? = nil,
+        endDate: Date? = nil,
+        projectId: String? = nil,
+        clientId: String? = nil
+    ) {
+        let formatter = ISO8601DateFormatter()
+        formatter.formatOptions = [.withFullDate]
+        
+        self.startDate = startDate.map { formatter.string(from: $0) }
+        self.endDate = endDate.map { formatter.string(from: $0) }
+        self.projectId = projectId
+        self.clientId = clientId
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Models/User.swift b/ios/TimeTracker/TimeTracker/Models/User.swift
new file mode 100644
index 0000000..51f1316
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Models/User.swift
@@ -0,0 +1,19 @@
+import Foundation
+
+struct User: Codable, Equatable {
+    let id: String
+    let username: String
+    let fullName: String?
+    let email: String
+}
+
+struct UserResponse: Codable {
+    let id: String
+    let username: String
+    let fullName: String?
+    let email: String
+    
+    func toUser() -> User {
+        User(id: id, username: username, fullName: fullName, email: email)
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Resources/Assets.xcassets/AccentColor.colorset/Contents.json b/ios/TimeTracker/TimeTracker/Resources/Assets.xcassets/AccentColor.colorset/Contents.json
new file mode 100644
index 0000000..aa06b69
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Resources/Assets.xcassets/AccentColor.colorset/Contents.json
@@ -0,0 +1,20 @@
+{
+  "colors" : [
+    {
+      "color" : {
+        "color-space" : "srgb",
+        "components" : {
+          "alpha" : "1.000",
+          "blue" : "0.984",
+          "green" : "0.584",
+          "red" : "0.000"
+        }
+      },
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/ios/TimeTracker/TimeTracker/Resources/Assets.xcassets/AppIcon.appiconset/Contents.json b/ios/TimeTracker/TimeTracker/Resources/Assets.xcassets/AppIcon.appiconset/Contents.json
new file mode 100644
index 0000000..13613e3
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Resources/Assets.xcassets/AppIcon.appiconset/Contents.json
@@ -0,0 +1,13 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/ios/TimeTracker/TimeTracker/Resources/Assets.xcassets/Contents.json b/ios/TimeTracker/TimeTracker/Resources/Assets.xcassets/Contents.json
new file mode 100644
index 0000000..73c0059
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Resources/Assets.xcassets/Contents.json
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/ios/TimeTracker/TimeTracker/Resources/Assets.xcassets/LaunchBackground.colorset/Contents.json b/ios/TimeTracker/TimeTracker/Resources/Assets.xcassets/LaunchBackground.colorset/Contents.json
new file mode 100644
index 0000000..97650a1
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Resources/Assets.xcassets/LaunchBackground.colorset/Contents.json
@@ -0,0 +1,20 @@
+{
+  "colors" : [
+    {
+      "color" : {
+        "color-space" : "srgb",
+        "components" : {
+          "alpha" : "1.000",
+          "blue" : "1.000",
+          "green" : "1.000",
+          "red" : "1.000"
+        }
+      },
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/ios/TimeTracker/TimeTracker/Shared/Components/LoadingView.swift b/ios/TimeTracker/TimeTracker/Shared/Components/LoadingView.swift
new file mode 100644
index 0000000..1944bf8
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Shared/Components/LoadingView.swift
@@ -0,0 +1,67 @@
+import SwiftUI
+
+struct LoadingView: View {
+    var message: String = "Loading..."
+    
+    var body: some View {
+        VStack(spacing: 16) {
+            ProgressView()
+                .scaleEffect(1.2)
+            Text(message)
+                .font(.subheadline)
+                .foregroundStyle(.secondary)
+        }
+        .frame(maxWidth: .infinity, maxHeight: .infinity)
+    }
+}
+
+struct ErrorView: View {
+    let message: String
+    var retryAction: (() -> Void)?
+    
+    var body: some View {
+        VStack(spacing: 16) {
+            Image(systemName: "exclamationmark.triangle")
+                .font(.largeTitle)
+                .foregroundStyle(.red)
+            
+            Text(message)
+                .font(.subheadline)
+                .foregroundStyle(.secondary)
+                .multilineTextAlignment(.center)
+            
+            if let retryAction = retryAction {
+                Button("Retry", action: retryAction)
+                    .buttonStyle(.borderedProminent)
+            }
+        }
+        .padding()
+        .frame(maxWidth: .infinity, maxHeight: .infinity)
+    }
+}
+
+struct EmptyView: View {
+    let icon: String
+    let title: String
+    var message: String? = nil
+    
+    var body: some View {
+        VStack(spacing: 16) {
+            Image(systemName: icon)
+                .font(.system(size: 48))
+                .foregroundStyle(.secondary)
+            
+            Text(title)
+                .font(.headline)
+            
+            if let message = message {
+                Text(message)
+                    .font(.subheadline)
+                    .foregroundStyle(.secondary)
+                    .multilineTextAlignment(.center)
+            }
+        }
+        .padding()
+        .frame(maxWidth: .infinity, maxHeight: .infinity)
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Shared/Components/ProjectColorDot.swift b/ios/TimeTracker/TimeTracker/Shared/Components/ProjectColorDot.swift
new file mode 100644
index 0000000..a57e774
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Shared/Components/ProjectColorDot.swift
@@ -0,0 +1,37 @@
+import SwiftUI
+
+struct ProjectColorDot: View {
+    let color: String?
+    var size: CGFloat = 12
+    
+    var body: some View {
+        Circle()
+            .fill(colorValue)
+            .frame(width: size, height: size)
+    }
+    
+    private var colorValue: Color {
+        if let hex = color {
+            return Color(hex: hex)
+        }
+        return .gray
+    }
+}
+
+struct ProjectColorBadge: View {
+    let color: String?
+    let name: String
+    
+    var body: some View {
+        HStack(spacing: 8) {
+            ProjectColorDot(color: color, size: 10)
+            Text(name)
+                .font(.subheadline)
+                .foregroundStyle(.primary)
+        }
+        .padding(.horizontal, 10)
+        .padding(.vertical, 6)
+        .background(Color(.systemGray6))
+        .cornerRadius(8)
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Shared/Components/StatCard.swift b/ios/TimeTracker/TimeTracker/Shared/Components/StatCard.swift
new file mode 100644
index 0000000..70ccfdb
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Shared/Components/StatCard.swift
@@ -0,0 +1,48 @@
+import SwiftUI
+
+struct StatCard: View {
+    let title: String
+    let value: String
+    let icon: String
+    var color: Color = .accentColor
+    
+    var body: some View {
+        VStack(alignment: .leading, spacing: 8) {
+            HStack {
+                Image(systemName: icon)
+                    .foregroundStyle(color)
+                Text(title)
+                    .font(.subheadline)
+                    .foregroundStyle(.secondary)
+            }
+            
+            Text(value)
+                .font(.title2)
+                .fontWeight(.semibold)
+                .foregroundStyle(.primary)
+        }
+        .frame(maxWidth: .infinity, alignment: .leading)
+        .padding()
+        .background(Color(.systemGray6))
+        .cornerRadius(12)
+    }
+}
+
+extension TimeInterval {
+    var formattedDuration: String {
+        let hours = Int(self) / 3600
+        let minutes = (Int(self) % 3600) / 60
+        let seconds = Int(self) % 60
+        
+        if hours > 0 {
+            return String(format: "%d:%02d:%02d", hours, minutes, seconds)
+        } else {
+            return String(format: "%02d:%02d", minutes, seconds)
+        }
+    }
+    
+    var formattedHours: String {
+        let hours = self / 3600
+        return String(format: "%.1fh", hours)
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Shared/Extensions/Color+Extensions.swift b/ios/TimeTracker/TimeTracker/Shared/Extensions/Color+Extensions.swift
new file mode 100644
index 0000000..c8b2144
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Shared/Extensions/Color+Extensions.swift
@@ -0,0 +1,46 @@
+import SwiftUI
+
+extension Color {
+    init(hex: String) {
+        let hex = hex.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
+        var int: UInt64 = 0
+        Scanner(string: hex).scanHexInt64(&int)
+        
+        let a, r, g, b: UInt64
+        switch hex.count {
+        case 3: // RGB (12-bit)
+            (a, r, g, b) = (255, (int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
+        case 6: // RGB (24-bit)
+            (a, r, g, b) = (255, int >> 16, int >> 8 & 0xFF, int & 0xFF)
+        case 8: // ARGB (32-bit)
+            (a, r, g, b) = (int >> 24, int >> 16 & 0xFF, int >> 8 & 0xFF, int & 0xFF)
+        default:
+            (a, r, g, b) = (255, 0, 0, 0)
+        }
+        
+        self.init(
+            .sRGB,
+            red: Double(r) / 255,
+            green: Double(g) / 255,
+            blue: Double(b) / 255,
+            opacity: Double(a) / 255
+        )
+    }
+    
+    static let defaultProjectColors: [Color] = [
+        Color(hex: "EF4444"), // Red
+        Color(hex: "F97316"), // Orange
+        Color(hex: "EAB308"), // Yellow
+        Color(hex: "22C55E"), // Green
+        Color(hex: "14B8A6"), // Teal
+        Color(hex: "06B6D4"), // Cyan
+        Color(hex: "3B82F6"), // Blue
+        Color(hex: "6366F1"), // Indigo
+        Color(hex: "A855F7"), // Purple
+        Color(hex: "EC4899"), // Pink
+    ]
+    
+    static func projectColor(for index: Int) -> Color {
+        defaultProjectColors[index % defaultProjectColors.count]
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Shared/Extensions/Date+Extensions.swift b/ios/TimeTracker/TimeTracker/Shared/Extensions/Date+Extensions.swift
new file mode 100644
index 0000000..21551a7
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Shared/Extensions/Date+Extensions.swift
@@ -0,0 +1,66 @@
+import Foundation
+
+extension Date {
+    var startOfDay: Date {
+        Calendar.current.startOfDay(for: self)
+    }
+    
+    var endOfDay: Date {
+        var components = DateComponents()
+        components.day = 1
+        components.second = -1
+        return Calendar.current.date(byAdding: components, to: startOfDay) ?? self
+    }
+    
+    var startOfWeek: Date {
+        let calendar = Calendar.current
+        let components = calendar.dateComponents([.yearForWeekOfYear, .weekOfYear], from: self)
+        return calendar.date(from: components) ?? self
+    }
+    
+    var endOfWeek: Date {
+        var components = DateComponents()
+        components.day = 7
+        components.second = -1
+        return Calendar.current.date(byAdding: components, to: startOfWeek) ?? self
+    }
+    
+    func formatted(style: DateFormatter.Style) -> String {
+        let formatter = DateFormatter()
+        formatter.dateStyle = style
+        formatter.timeStyle = .none
+        return formatter.string(from: self)
+    }
+    
+    func formattedTime() -> String {
+        let formatter = DateFormatter()
+        formatter.dateStyle = .none
+        formatter.timeStyle = .short
+        return formatter.string(from: self)
+    }
+    
+    func formattedDateTime() -> String {
+        let formatter = DateFormatter()
+        formatter.dateStyle = .medium
+        formatter.timeStyle = .short
+        return formatter.string(from: self)
+    }
+    
+    var iso8601String: String {
+        let formatter = ISO8601DateFormatter()
+        formatter.formatOptions = [.withInternetDateTime]
+        return formatter.string(from: self)
+    }
+    
+    var iso8601FullDate: String {
+        let formatter = ISO8601DateFormatter()
+        formatter.formatOptions = [.withFullDate]
+        return formatter.string(from: self)
+    }
+    
+    static func fromISO8601(_ string: String) -> Date? {
+        let formatter = ISO8601DateFormatter()
+        formatter.formatOptions = [.withInternetDateTime]
+        return formatter.date(from: string)
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/Shared/Extensions/View+Extensions.swift b/ios/TimeTracker/TimeTracker/Shared/Extensions/View+Extensions.swift
new file mode 100644
index 0000000..ce73a1c
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/Shared/Extensions/View+Extensions.swift
@@ -0,0 +1,38 @@
+import SwiftUI
+
+extension View {
+    func hideKeyboard() {
+        UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)
+    }
+    
+    @ViewBuilder
+    func `if`<Transform: View>(_ condition: Bool, transform: (Self) -> Transform) -> some View {
+        if condition {
+            transform(self)
+        } else {
+            self
+        }
+    }
+}
+
+struct FormFieldStyle: ViewModifier {
+    var isEditing: Bool = false
+    
+    func body(content: Content) -> some View {
+        content
+            .padding(.horizontal, 16)
+            .padding(.vertical, 12)
+            .background(Color(.systemGray6))
+            .cornerRadius(10)
+            .overlay(
+                RoundedRectangle(cornerRadius: 10)
+                    .stroke(isEditing ? Color.accentColor : Color.clear, lineWidth: 2)
+            )
+    }
+}
+
+extension View {
+    func formFieldStyle(isEditing: Bool = false) -> some View {
+        modifier(FormFieldStyle(isEditing: isEditing))
+    }
+}
diff --git a/ios/TimeTracker/TimeTracker/TimeTracker.entitlements b/ios/TimeTracker/TimeTracker/TimeTracker.entitlements
new file mode 100644
index 0000000..6bfcb0f
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/TimeTracker.entitlements
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>com.apple.security.application-groups</key>
+    <array>
+        <string>group.com.timetracker.app</string>
+    </array>
+</dict>
+</plist>
diff --git a/ios/TimeTracker/TimeTracker/TimeTrackerApp/TimeTrackerApp.swift b/ios/TimeTracker/TimeTracker/TimeTrackerApp/TimeTrackerApp.swift
new file mode 100644
index 0000000..57b7518
--- /dev/null
+++ b/ios/TimeTracker/TimeTracker/TimeTrackerApp/TimeTrackerApp.swift
@@ -0,0 +1,68 @@
+import SwiftUI
+
+@main
+struct TimeTrackerApp: App {
+    @StateObject private var authManager = AuthManager.shared
+    
+    var body: some Scene {
+        WindowGroup {
+            RootView()
+                .environmentObject(authManager)
+        }
+    }
+}
+
+struct RootView: View {
+    @EnvironmentObject var authManager: AuthManager
+    
+    var body: some View {
+        Group {
+            if authManager.isAuthenticated {
+                MainTabView()
+            } else {
+                LoginView()
+            }
+        }
+        .task {
+            await authManager.checkAuthState()
+        }
+    }
+}
+
+struct MainTabView: View {
+    @State private var selectedTab = 0
+    
+    var body: some View {
+        TabView(selection: $selectedTab) {
+            DashboardView()
+                .tabItem {
+                    Label("Dashboard", systemImage: "chart.bar")
+                }
+                .tag(0)
+            
+            TimerView()
+                .tabItem {
+                    Label("Timer", systemImage: "timer")
+                }
+                .tag(1)
+            
+            TimeEntriesView()
+                .tabItem {
+                    Label("Entries", systemImage: "clock")
+                }
+                .tag(2)
+            
+            ProjectsView()
+                .tabItem {
+                    Label("Projects", systemImage: "folder")
+                }
+                .tag(3)
+            
+            ClientsView()
+                .tabItem {
+                    Label("Clients", systemImage: "person.2")
+                }
+                .tag(4)
+        }
+    }
+}
diff --git a/ios/TimeTracker/TimeTrackerWidget/Assets.xcassets/Contents.json b/ios/TimeTracker/TimeTrackerWidget/Assets.xcassets/Contents.json
new file mode 100644
index 0000000..73c0059
--- /dev/null
+++ b/ios/TimeTracker/TimeTrackerWidget/Assets.xcassets/Contents.json
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/ios/TimeTracker/TimeTrackerWidget/Assets.xcassets/WidgetBackground.colorset/Contents.json b/ios/TimeTracker/TimeTrackerWidget/Assets.xcassets/WidgetBackground.colorset/Contents.json
new file mode 100644
index 0000000..97650a1
--- /dev/null
+++ b/ios/TimeTracker/TimeTrackerWidget/Assets.xcassets/WidgetBackground.colorset/Contents.json
@@ -0,0 +1,20 @@
+{
+  "colors" : [
+    {
+      "color" : {
+        "color-space" : "srgb",
+        "components" : {
+          "alpha" : "1.000",
+          "blue" : "1.000",
+          "green" : "1.000",
+          "red" : "1.000"
+        }
+      },
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/ios/TimeTracker/TimeTrackerWidget/Info.plist b/ios/TimeTracker/TimeTrackerWidget/Info.plist
new file mode 100644
index 0000000..4a4caae
--- /dev/null
+++ b/ios/TimeTracker/TimeTrackerWidget/Info.plist
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>CFBundleDevelopmentRegion</key>
+    <string>$(DEVELOPMENT_LANGUAGE)</string>
+    <key>CFBundleDisplayName</key>
+    <string>Timer</string>
+    <key>CFBundleExecutable</key>
+    <string>$(EXECUTABLE_NAME)</string>
+    <key>CFBundleIdentifier</key>
+    <string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+    <key>CFBundleInfoDictionaryVersion</key>
+    <string>6.0</string>
+    <key>CFBundleName</key>
+    <string>$(PRODUCT_NAME)</string>
+    <key>CFBundlePackageType</key>
+    <string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+    <key>CFBundleShortVersionString</key>
+    <string>$(MARKETING_VERSION)</string>
+    <key>CFBundleVersion</key>
+    <string>$(CURRENT_PROJECT_VERSION)</string>
+    <key>NSExtension</key>
+    <dict>
+        <key>NSExtensionPointIdentifier</key>
+        <string>com.apple.widgetkit-extension</string>
+    </dict>
+</dict>
+</plist>
diff --git a/ios/TimeTracker/TimeTrackerWidget/TimeTrackerWidget.entitlements b/ios/TimeTracker/TimeTrackerWidget/TimeTrackerWidget.entitlements
new file mode 100644
index 0000000..6bfcb0f
--- /dev/null
+++ b/ios/TimeTracker/TimeTrackerWidget/TimeTrackerWidget.entitlements
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>com.apple.security.application-groups</key>
+    <array>
+        <string>group.com.timetracker.app</string>
+    </array>
+</dict>
+</plist>
diff --git a/ios/TimeTracker/TimeTrackerWidget/TimeTrackerWidget.swift b/ios/TimeTracker/TimeTrackerWidget/TimeTrackerWidget.swift
new file mode 100644
index 0000000..d8d4cb7
--- /dev/null
+++ b/ios/TimeTracker/TimeTrackerWidget/TimeTrackerWidget.swift
@@ -0,0 +1,194 @@
+import WidgetKit
+import SwiftUI
+
+struct TimerEntry: TimelineEntry {
+    let date: Date
+    let timer: WidgetTimer?
+    let projectName: String?
+    let projectColor: String?
+}
+
+struct WidgetTimer: Codable {
+    let id: String
+    let startTime: String
+    let projectId: String?
+    
+    var elapsedTime: TimeInterval {
+        guard let start = ISO8601DateFormatter().date(from: startTime) else {
+            return 0
+        }
+        return Date().timeIntervalSince(start)
+    }
+}
+
+struct Provider: TimelineProvider {
+    private let appGroupIdentifier = "group.com.timetracker.app"
+    
+    func placeholder(in context: Context) -> TimerEntry {
+        TimerEntry(
+            date: Date(),
+            timer: nil,
+            projectName: nil,
+            projectColor: nil
+        )
+    }
+    
+    func getSnapshot(in context: Context, completion: @escaping (TimerEntry) -> Void) {
+        let entry = loadTimerEntry()
+        completion(entry)
+    }
+    
+    func getTimeline(in context: Context, completion: @escaping (Timeline<TimerEntry>) -> Void) {
+        let entry = loadTimerEntry()
+        
+        let nextUpdate = Calendar.current.date(byAdding: .minute, value: 15, to: Date())!
+        let timeline = Timeline(entries: [entry], policy: .after(nextUpdate))
+        
+        completion(timeline)
+    }
+    
+    private func loadTimerEntry() -> TimerEntry {
+        guard let userDefaults = UserDefaults(suiteName: appGroupIdentifier),
+              let data = userDefaults.data(forKey: "cachedTimer") else {
+            return TimerEntry(
+                date: Date(),
+                timer: nil,
+                projectName: nil,
+                projectColor: nil
+            )
+        }
+        
+        do {
+            let timer = try JSONDecoder().decode(WidgetTimer.self, from: data)
+            return TimerEntry(
+                date: Date(),
+                timer: timer,
+                projectName: timer.projectId,
+                projectColor: nil
+            )
+        } catch {
+            return TimerEntry(
+                date: Date(),
+                timer: nil,
+                projectName: nil,
+                projectColor: nil
+            )
+        }
+    }
+}
+
+struct TimerWidgetEntryView: View {
+    var entry: Provider.Entry
+    @Environment(\.widgetFamily) var family
+    
+    var body: some View {
+        switch family {
+        case .systemSmall:
+            smallWidget
+        case .systemMedium:
+            mediumWidget
+        default:
+            smallWidget
+        }
+    }
+    
+    private var smallWidget: some View {
+        VStack(spacing: 8) {
+            if let timer = entry.timer {
+                Image(systemName: "timer")
+                    .font(.title2)
+                    .foregroundStyle(.green)
+                
+                Text(timer.elapsedTime.formattedDuration)
+                    .font(.system(size: 24, weight: .medium, design: .monospaced))
+                
+                if let projectId = entry.projectName {
+                    Text(projectId)
+                        .font(.caption)
+                        .foregroundStyle(.secondary)
+                        .lineLimit(1)
+                }
+            } else {
+                Image(systemName: "timer")
+                    .font(.title2)
+                    .foregroundStyle(.secondary)
+                
+                Text("No timer")
+                    .font(.subheadline)
+                    .foregroundStyle(.secondary)
+            }
+        }
+        .frame(maxWidth: .infinity, maxHeight: .infinity)
+        .containerBackground(for: .widget) {
+            Color(.systemBackground)
+        }
+    }
+    
+    private var mediumWidget: some View {
+        HStack(spacing: 16) {
+            if let timer = entry.timer {
+                VStack(spacing: 4) {
+                    Image(systemName: "timer")
+                        .font(.title)
+                        .foregroundStyle(.green)
+                    
+                    Text(timer.elapsedTime.formattedDuration)
+                        .font(.system(size: 28, weight: .medium, design: .monospaced))
+                }
+                
+                VStack(alignment: .leading, spacing: 4) {
+                    if let projectId = entry.projectName {
+                        Text(projectId)
+                            .font(.headline)
+                    }
+                    Text("Tap to open")
+                        .font(.caption)
+                        .foregroundStyle(.secondary)
+                }
+            } else {
+                VStack(spacing: 8) {
+                    Image(systemName: "timer")
+                        .font(.title)
+                        .foregroundStyle(.secondary)
+                    
+                    Text("No active timer")
+                        .font(.subheadline)
+                        .foregroundStyle(.secondary)
+                }
+                .frame(maxWidth: .infinity)
+            }
+        }
+        .padding()
+        .frame(maxWidth: .infinity, maxHeight: .infinity)
+        .containerBackground(for: .widget) {
+            Color(.systemBackground)
+        }
+    }
+}
+
+extension TimeInterval {
+    var formattedDuration: String {
+        let hours = Int(self) / 3600
+        let minutes = (Int(self) % 3600) / 60
+        let seconds = Int(self) % 60
+        
+        if hours > 0 {
+            return String(format: "%d:%02d:%02d", hours, minutes, seconds)
+        } else {
+            return String(format: "%02d:%02d", minutes, seconds)
+        }
+    }
+}
+
+struct TimeTrackerWidget: Widget {
+    let kind: String = "TimeTrackerWidget"
+    
+    var body: some WidgetConfiguration {
+        StaticConfiguration(kind: kind, provider: Provider()) { entry in
+            TimerWidgetEntryView(entry: entry)
+        }
+        .configurationDisplayName("Timer")
+        .description("Shows your active timer.")
+        .supportedFamilies([.systemSmall, .systemMedium])
+    }
+}
diff --git a/ios/TimeTracker/TimeTrackerWidget/TimeTrackerWidgetBundle.swift b/ios/TimeTracker/TimeTrackerWidget/TimeTrackerWidgetBundle.swift
new file mode 100644
index 0000000..c70d43b
--- /dev/null
+++ b/ios/TimeTracker/TimeTrackerWidget/TimeTrackerWidgetBundle.swift
@@ -0,0 +1,9 @@
+import WidgetKit
+import SwiftUI
+
+@main
+struct TimeTrackerWidgetBundle: WidgetBundle {
+    var body: some Widget {
+        TimeTrackerWidget()
+    }
+}
diff --git a/ios/TimeTracker/project.yml b/ios/TimeTracker/project.yml
new file mode 100644
index 0000000..f7a554c
--- /dev/null
+++ b/ios/TimeTracker/project.yml
@@ -0,0 +1,94 @@
+name: TimeTracker
+options:
+  bundleIdPrefix: com.timetracker
+  deploymentTarget:
+    iOS: "17.0"
+  xcodeVersion: "15.0"
+  generateEmptyDirectories: true
+
+packages:
+  SQLite:
+    url: https://github.com/stephencelis/SQLite.swift
+    version: 0.15.3
+  KeychainAccess:
+    url: https://github.com/kishikawakatsumi/KeychainAccess
+    version: 4.2.2
+
+settings:
+  base:
+    SWIFT_VERSION: "5.9"
+    DEVELOPMENT_TEAM: ""
+    CODE_SIGN_IDENTITY: ""
+    CODE_SIGNING_REQUIRED: "NO"
+    CODE_SIGNING_ALLOWED: "NO"
+
+targets:
+  TimeTracker:
+    type: application
+    platform: iOS
+    sources:
+      - path: TimeTracker
+        excludes:
+          - "**/.DS_Store"
+    settings:
+      base:
+        INFOPLIST_FILE: TimeTracker/Info.plist
+        PRODUCT_BUNDLE_IDENTIFIER: com.timetracker.app
+        MARKETING_VERSION: "1.0.0"
+        CURRENT_PROJECT_VERSION: "1"
+        ASSETCATALOG_COMPILER_APPICON_NAME: AppIcon
+        TARGETED_DEVICE_FAMILY: "1,2"
+        SUPPORTS_MAC_DESIGNED_FOR_IPHONE_IPAD: "YES"
+    dependencies:
+      - target: TimeTrackerWidget
+        embed: true
+      - package: SQLite
+        product: SQLite
+      - package: KeychainAccess
+    entitlements:
+      path: TimeTracker/TimeTracker.entitlements
+      properties:
+        com.apple.security.application-groups:
+          - group.com.timetracker.app
+
+  TimeTrackerWidget:
+    type: app-extension
+    platform: iOS
+    sources:
+      - path: TimeTrackerWidget
+        excludes:
+          - "**/.DS_Store"
+    settings:
+      base:
+        INFOPLIST_FILE: TimeTrackerWidget/Info.plist
+        PRODUCT_BUNDLE_IDENTIFIER: com.timetracker.app.widget
+        MARKETING_VERSION: "1.0.0"
+        CURRENT_PROJECT_VERSION: "1"
+        SKIP_INSTALL: "YES"
+        ASSETCATALOG_COMPILER_WIDGET_BACKGROUND_COLOR_NAME: WidgetBackground
+        CODE_SIGN_ENTITLEMENTS: TimeTrackerWidget/TimeTrackerWidget.entitlements
+    dependencies:
+      - package: SQLite
+        product: SQLite
+    entitlements:
+      path: TimeTrackerWidget/TimeTrackerWidget.entitlements
+      properties:
+        com.apple.security.application-groups:
+          - group.com.timetracker.app
+
+schemes:
+  TimeTracker:
+    build:
+      targets:
+        TimeTracker: all
+        TimeTrackerWidget: all
+    run:
+      config: Debug
+    test:
+      config: Debug
+    profile:
+      config: Release
+    analyze:
+      config: Debug
+    archive:
+      config: Release