Signed-off-by: Matt Bruce <mbrucedogs@gmail.com>

README.md

@@ -14,9 +14,12 @@ This app provides interactive demos for all LocalData storage options:
 | **Encrypted** | Encrypted logs (AES or ChaCha20) | Encrypted File System |
 | **Sync** | Platform availability & sync policies | Multiple |
 
+The project also includes a watchOS companion app target for watch-specific demos.
+
 ## Requirements
 
 - iOS 17.0+
+- watchOS 10.0+ (companion app target)
 - Xcode 15+
 
 ## Getting Started
@@ -38,6 +41,11 @@ SecureStorgageSample/
     ├── FileSystemDemo.swift
     ├── EncryptedStorageDemo.swift
     └── PlatformSyncDemo.swift
+SecureStorageSample Watch App/
+├── SecureStorageSampleApp.swift
+├── ContentView.swift
+└── Services/
+    └── WatchConnectivityService.swift
 ```
 
 ## Storage Key Examples

SecureStorageSample Watch App/Assets.xcassets/AccentColor.colorset/Contents.json

@@ -0,0 +1,11 @@
+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

SecureStorageSample Watch App/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,13 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "platform" : "watchos",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

SecureStorageSample Watch App/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

SecureStorageSample Watch App/ContentView.swift

@@ -0,0 +1,45 @@
+//
+//  ContentView.swift
+//  SecureStorageSample Watch App
+//
+//  Created by Matt Bruce on 1/14/26.
+//
+
+import SwiftUI
+
+struct ContentView: View {
+    @State private var connectivity = WatchConnectivityService.shared
+
+    var body: some View {
+        VStack {
+            if let profile = connectivity.profile {
+                Text(profile.name)
+                    .bold()
+                Text(profile.email)
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+                Text("Age: \(profile.ageDescription)")
+                    .font(.caption2)
+                    .foregroundStyle(.secondary)
+                Text(profile.createdAt, format: .dateTime)
+                    .font(.caption2)
+                    .foregroundStyle(.secondary)
+            } else {
+                Text("No profile synced yet")
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+            }
+
+            if !connectivity.statusMessage.isEmpty {
+                Text(connectivity.statusMessage)
+                    .font(.caption2)
+                    .foregroundStyle(.secondary)
+            }
+        }
+        .padding()
+    }
+}
+
+#Preview {
+    ContentView()
+}

SecureStorageSample Watch App/Models/UserProfile.swift

@@ -0,0 +1,15 @@
+import Foundation
+
+nonisolated(unsafe)
+struct UserProfile: Codable, Sendable {
+    static let storageKeyName = "user_profile.json"
+
+    let name: String
+    let email: String
+    let age: Int?
+    let createdAt: Date
+
+    var ageDescription: String {
+        age.map(String.init) ?? "n/a"
+    }
+}

SecureStorageSample Watch App/SecureStorageSampleApp.swift

@@ -0,0 +1,21 @@
+//
+//  SecureStorageSampleApp.swift
+//  SecureStorageSample Watch App
+//
+//  Created by Matt Bruce on 1/14/26.
+//
+
+import SwiftUI
+
+@main
+struct SecureStorageSample_Watch_AppApp: App {
+    init() {
+        _ = WatchConnectivityService.shared
+    }
+
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+    }
+}

SecureStorageSample Watch App/Services/WatchConnectivityService.swift

@@ -0,0 +1,59 @@
+import Foundation
+import Observation
+import WatchConnectivity
+
+@MainActor
+@Observable
+final class WatchConnectivityService: NSObject, WCSessionDelegate {
+    static let shared = WatchConnectivityService()
+
+    private(set) var profile: UserProfile?
+    private(set) var statusMessage: String = ""
+
+    private override init() {
+        super.init()
+        activateIfSupported()
+        loadCurrentContext()
+    }
+
+    private func activateIfSupported() {
+        guard WCSession.isSupported() else {
+            statusMessage = "WatchConnectivity not supported"
+            return
+        }
+        let session = WCSession.default
+        session.delegate = self
+        session.activate()
+    }
+
+    private func loadCurrentContext() {
+        guard WCSession.isSupported() else { return }
+        updateProfile(from: WCSession.default.applicationContext)
+    }
+
+    private func updateProfile(from context: [String: Any]) {
+        guard let data = context[UserProfile.storageKeyName] as? Data else {
+            statusMessage = "No profile received"
+            return
+        }
+
+        do {
+            profile = try JSONDecoder().decode(UserProfile.self, from: data)
+            statusMessage = "Profile synced"
+        } catch {
+            statusMessage = "Failed to decode profile"
+        }
+    }
+
+    func session(
+        _ session: WCSession,
+        activationDidCompleteWith activationState: WCSessionActivationState,
+        error: Error?
+    ) {
+        loadCurrentContext()
+    }
+
+    func session(_ session: WCSession, didReceiveApplicationContext applicationContext: [String: Any]) {
+        updateProfile(from: applicationContext)
+    }
+}

SecureStorageSample Watch AppTests/SecureStorageSample_Watch_AppTests.swift

@@ -0,0 +1,17 @@
+//
+//  SecureStorageSample_Watch_AppTests.swift
+//  SecureStorageSample Watch AppTests
+//
+//  Created by Matt Bruce on 1/14/26.
+//
+
+import Testing
+@testable import SecureStorageSample_Watch_App
+
+struct SecureStorageSample_Watch_AppTests {
+
+    @Test func example() async throws {
+        // Write your test here and use APIs like `#expect(...)` to check expected conditions.
+    }
+
+}

SecureStorageSample Watch AppUITests/SecureStorageSample_Watch_AppUITests.swift

@@ -0,0 +1,41 @@
+//
+//  SecureStorageSample_Watch_AppUITests.swift
+//  SecureStorageSample Watch AppUITests
+//
+//  Created by Matt Bruce on 1/14/26.
+//
+
+import XCTest
+
+final class SecureStorageSample_Watch_AppUITests: XCTestCase {
+
+    override func setUpWithError() throws {
+        // Put setup code here. This method is called before the invocation of each test method in the class.
+
+        // In UI tests it is usually best to stop immediately when a failure occurs.
+        continueAfterFailure = false
+
+        // In UI tests it’s important to set the initial state - such as interface orientation - required for your tests before they run. The setUp method is a good place to do this.
+    }
+
+    override func tearDownWithError() throws {
+        // Put teardown code here. This method is called after the invocation of each test method in the class.
+    }
+
+    @MainActor
+    func testExample() throws {
+        // UI tests must launch the application that they test.
+        let app = XCUIApplication()
+        app.launch()
+
+        // Use XCTAssert and related functions to verify your tests produce the correct results.
+    }
+
+    @MainActor
+    func testLaunchPerformance() throws {
+        // This measures how long it takes to launch your application.
+        measure(metrics: [XCTApplicationLaunchMetric()]) {
+            XCUIApplication().launch()
+        }
+    }
+}

SecureStorageSample Watch AppUITests/SecureStorageSample_Watch_AppUITestsLaunchTests.swift

@@ -0,0 +1,33 @@
+//
+//  SecureStorageSample_Watch_AppUITestsLaunchTests.swift
+//  SecureStorageSample Watch AppUITests
+//
+//  Created by Matt Bruce on 1/14/26.
+//
+
+import XCTest
+
+final class SecureStorageSample_Watch_AppUITestsLaunchTests: XCTestCase {
+
+    override class var runsForEachTargetApplicationUIConfiguration: Bool {
+        true
+    }
+
+    override func setUpWithError() throws {
+        continueAfterFailure = false
+    }
+
+    @MainActor
+    func testLaunch() throws {
+        let app = XCUIApplication()
+        app.launch()
+
+        // Insert steps here to perform after app launch but before taking a screenshot,
+        // such as logging into a test account or navigating somewhere in the app
+
+        let attachment = XCTAttachment(screenshot: app.screenshot())
+        attachment.name = "Launch Screen"
+        attachment.lifetime = .keepAlways
+        add(attachment)
+    }
+}

SecureStorgageSample.xcodeproj/project.pbxproj

@@ -8,6 +8,7 @@
 
 /* Begin PBXBuildFile section */
 		EA179D562F17379800B1D54A /* LocalData in Frameworks */ = {isa = PBXBuildFile; productRef = EA179D552F17379800B1D54A /* LocalData */; };
+		EA65D70D2F17DDEB00C48466 /* SecureStorageSample Watch App.app in Embed Watch Content */ = {isa = PBXBuildFile; fileRef = EA65D6E52F17DD6700C48466 /* SecureStorageSample Watch App.app */; settings = {ATTRIBUTES = (CodeSignOnCopy, ); }; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -25,12 +26,50 @@
 			remoteGlobalIDString = EA179D002F1722BB00B1D54A;
 			remoteInfo = SecureStorgageSample;
 		};
+		EA65D6F22F17DD6800C48466 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = EA179CF92F1722BB00B1D54A /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = EA65D6E42F17DD6700C48466;
+			remoteInfo = "SecureStorageSample Watch App";
+		};
+		EA65D6FC2F17DD6800C48466 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = EA179CF92F1722BB00B1D54A /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = EA65D6E42F17DD6700C48466;
+			remoteInfo = "SecureStorageSample Watch App";
+		};
+		EA65D70E2F17DDEB00C48466 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = EA179CF92F1722BB00B1D54A /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = EA65D6E42F17DD6700C48466;
+			remoteInfo = "SecureStorageSample Watch App";
+		};
 /* End PBXContainerItemProxy section */
 
+/* Begin PBXCopyFilesBuildPhase section */
+		EA179D312F1722BC00B1D54A /* Embed Watch Content */ = {
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+			buildActionMask = 2147483647;
+			dstPath = "$(CONTENTS_FOLDER_PATH)/Watch";
+			dstSubfolderSpec = 16;
+			files = (
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+			name = "Embed Watch Content";
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXCopyFilesBuildPhase section */
+
 /* Begin PBXFileReference section */
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+		EA65D6E52F17DD6700C48466 /* SecureStorageSample Watch App.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = "SecureStorageSample Watch App.app"; sourceTree = BUILT_PRODUCTS_DIR; };
+		EA65D6F12F17DD6800C48466 /* SecureStorageSample Watch AppTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = "SecureStorageSample Watch AppTests.xctest"; sourceTree = BUILT_PRODUCTS_DIR; };
+		EA65D6FB2F17DD6800C48466 /* SecureStorageSample Watch AppUITests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = "SecureStorageSample Watch AppUITests.xctest"; sourceTree = BUILT_PRODUCTS_DIR; };
 /* End PBXFileReference section */
 
 /* Begin PBXFileSystemSynchronizedRootGroup section */
@@ -49,6 +88,21 @@
 			path = SecureStorgageSampleUITests;
 			sourceTree = "<group>";
 		};
+		EA65D6E62F17DD6700C48466 /* SecureStorageSample Watch App */ = {
+			isa = PBXFileSystemSynchronizedRootGroup;
+			path = "SecureStorageSample Watch App";
+			sourceTree = "<group>";
+		};
+		EA65D6F42F17DD6800C48466 /* SecureStorageSample Watch AppTests */ = {
+			isa = PBXFileSystemSynchronizedRootGroup;
+			path = "SecureStorageSample Watch AppTests";
+			sourceTree = "<group>";
+		};
+		EA65D6FE2F17DD6800C48466 /* SecureStorageSample Watch AppUITests */ = {
+			isa = PBXFileSystemSynchronizedRootGroup;
+			path = "SecureStorageSample Watch AppUITests";
+			sourceTree = "<group>";
+		};
 /* End PBXFileSystemSynchronizedRootGroup section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -74,6 +128,27 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
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 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
@@ -83,6 +158,10 @@
 				EA179D032F1722BB00B1D54A /* SecureStorgageSample */,
 				EA179D112F1722BC00B1D54A /* SecureStorgageSampleTests */,
 				EA179D1B2F1722BC00B1D54A /* SecureStorgageSampleUITests */,
+				EA65D6E62F17DD6700C48466 /* SecureStorageSample Watch App */,
+				EA65D6F42F17DD6800C48466 /* SecureStorageSample Watch AppTests */,
+				EA65D6FE2F17DD6800C48466 /* SecureStorageSample Watch AppUITests */,
+				EA65D70C2F17DDEB00C48466 /* Frameworks */,
 				EA179D022F1722BB00B1D54A /* Products */,
 			);
 			sourceTree = "<group>";
@@ -93,10 +172,20 @@
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 				EA179D182F1722BC00B1D54A /* SecureStorgageSampleUITests.xctest */,
+				EA65D6E52F17DD6700C48466 /* SecureStorageSample Watch App.app */,
+				EA65D6F12F17DD6800C48466 /* SecureStorageSample Watch AppTests.xctest */,
+				EA65D6FB2F17DD6800C48466 /* SecureStorageSample Watch AppUITests.xctest */,
 			);
 			name = Products;
 			sourceTree = "<group>";
 		};
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+			children = (
+			);
+			name = Frameworks;
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@@ -107,10 +196,12 @@
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 				EA179CFF2F1722BB00B1D54A /* Resources */,
+				EA179D312F1722BC00B1D54A /* Embed Watch Content */,
 			);
 			buildRules = (
 			);
 			dependencies = (
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 			fileSystemSynchronizedGroups = (
 				EA179D032F1722BB00B1D54A /* SecureStorgageSample */,
@@ -169,6 +260,74 @@
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 			productType = "com.apple.product-type.bundle.ui-testing";
 		};
+		EA65D6E42F17DD6700C48466 /* SecureStorageSample Watch App */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = EA65D7032F17DD6800C48466 /* Build configuration list for PBXNativeTarget "SecureStorageSample Watch App" */;
+			buildPhases = (
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+			fileSystemSynchronizedGroups = (
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+			productReference = EA65D6E52F17DD6700C48466 /* SecureStorageSample Watch App.app */;
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@@ -190,6 +349,17 @@
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+					EA65D6FA2F17DD6800C48466 = {
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 			};
 			buildConfigurationList = EA179CFC2F1722BB00B1D54A /* Build configuration list for PBXProject "SecureStorgageSample" */;
@@ -212,6 +382,9 @@
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 				EA179D0D2F1722BC00B1D54A /* SecureStorgageSampleTests */,
 				EA179D172F1722BC00B1D54A /* SecureStorgageSampleUITests */,
+				EA65D6E42F17DD6700C48466 /* SecureStorageSample Watch App */,
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+				EA65D6FA2F17DD6800C48466 /* SecureStorageSample Watch AppUITests */,
 			);
 		};
 /* End PBXProject section */
@@ -238,6 +411,27 @@
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 		};
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@@ -262,6 +456,27 @@
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+		};
+		EA65D70F2F17DDEB00C48466 /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			target = EA65D6E42F17DD6700C48466 /* SecureStorageSample Watch App */;
+			targetProxy = EA65D70E2F17DDEB00C48466 /* PBXContainerItemProxy */;
+		};
 /* End PBXTargetDependency section */
 
 /* Begin XCBuildConfiguration section */
@@ -543,6 +773,162 @@
 			};
 			name = Release;
 		};
+		EA65D7042F17DD6800C48466 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_TEAM = 6R7KLBPBLZ;
+				ENABLE_PREVIEWS = YES;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_KEY_CFBundleDisplayName = SecureStorageSample;
+				INFOPLIST_KEY_UISupportedInterfaceOrientations = "UIInterfaceOrientationPortrait UIInterfaceOrientationPortraitUpsideDown";
+				INFOPLIST_KEY_WKCompanionAppBundleIdentifier = com.mbrucedogs.SecureStorgageSample;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = com.mbrucedogs.SecureStorgageSample.watchkitapp;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SDKROOT = watchos;
+				SKIP_INSTALL = YES;
+				STRING_CATALOG_GENERATE_SYMBOLS = YES;
+				SWIFT_APPROACHABLE_CONCURRENCY = YES;
+				SWIFT_DEFAULT_ACTOR_ISOLATION = MainActor;
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_UPCOMING_FEATURE_MEMBER_IMPORT_VISIBILITY = YES;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = 4;
+				WATCHOS_DEPLOYMENT_TARGET = 10.0;
+			};
+			name = Debug;
+		};
+		EA65D7052F17DD6800C48466 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_TEAM = 6R7KLBPBLZ;
+				ENABLE_PREVIEWS = YES;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_KEY_CFBundleDisplayName = SecureStorageSample;
+				INFOPLIST_KEY_UISupportedInterfaceOrientations = "UIInterfaceOrientationPortrait UIInterfaceOrientationPortraitUpsideDown";
+				INFOPLIST_KEY_WKCompanionAppBundleIdentifier = com.mbrucedogs.SecureStorgageSample;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = com.mbrucedogs.SecureStorgageSample.watchkitapp;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SDKROOT = watchos;
+				SKIP_INSTALL = YES;
+				STRING_CATALOG_GENERATE_SYMBOLS = YES;
+				SWIFT_APPROACHABLE_CONCURRENCY = YES;
+				SWIFT_DEFAULT_ACTOR_ISOLATION = MainActor;
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_UPCOMING_FEATURE_MEMBER_IMPORT_VISIBILITY = YES;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = 4;
+				WATCHOS_DEPLOYMENT_TARGET = 10.0;
+			};
+			name = Release;
+		};
+		EA65D7072F17DD6800C48466 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				BUNDLE_LOADER = "$(TEST_HOST)";
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_TEAM = 6R7KLBPBLZ;
+				GENERATE_INFOPLIST_FILE = YES;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = "com.mbrucedogs.SecureStorageSample-Watch-AppTests";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SDKROOT = watchos;
+				STRING_CATALOG_GENERATE_SYMBOLS = NO;
+				SWIFT_APPROACHABLE_CONCURRENCY = YES;
+				SWIFT_EMIT_LOC_STRINGS = NO;
+				SWIFT_UPCOMING_FEATURE_MEMBER_IMPORT_VISIBILITY = YES;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = 4;
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/SecureStorageSample Watch App.app/$(BUNDLE_EXECUTABLE_FOLDER_PATH)/SecureStorageSample Watch App";
+				WATCHOS_DEPLOYMENT_TARGET = 10.0;
+			};
+			name = Debug;
+		};
+		EA65D7082F17DD6800C48466 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				BUNDLE_LOADER = "$(TEST_HOST)";
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_TEAM = 6R7KLBPBLZ;
+				GENERATE_INFOPLIST_FILE = YES;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = "com.mbrucedogs.SecureStorageSample-Watch-AppTests";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SDKROOT = watchos;
+				STRING_CATALOG_GENERATE_SYMBOLS = NO;
+				SWIFT_APPROACHABLE_CONCURRENCY = YES;
+				SWIFT_EMIT_LOC_STRINGS = NO;
+				SWIFT_UPCOMING_FEATURE_MEMBER_IMPORT_VISIBILITY = YES;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = 4;
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/SecureStorageSample Watch App.app/$(BUNDLE_EXECUTABLE_FOLDER_PATH)/SecureStorageSample Watch App";
+				WATCHOS_DEPLOYMENT_TARGET = 10.0;
+			};
+			name = Release;
+		};
+		EA65D70A2F17DD6800C48466 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_TEAM = 6R7KLBPBLZ;
+				GENERATE_INFOPLIST_FILE = YES;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = "com.mbrucedogs.SecureStorageSample-Watch-AppUITests";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SDKROOT = watchos;
+				STRING_CATALOG_GENERATE_SYMBOLS = NO;
+				SWIFT_APPROACHABLE_CONCURRENCY = YES;
+				SWIFT_EMIT_LOC_STRINGS = NO;
+				SWIFT_UPCOMING_FEATURE_MEMBER_IMPORT_VISIBILITY = YES;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = 4;
+				TEST_TARGET_NAME = "SecureStorageSample Watch App";
+				WATCHOS_DEPLOYMENT_TARGET = 10.0;
+			};
+			name = Debug;
+		};
+		EA65D70B2F17DD6800C48466 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_TEAM = 6R7KLBPBLZ;
+				GENERATE_INFOPLIST_FILE = YES;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = "com.mbrucedogs.SecureStorageSample-Watch-AppUITests";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SDKROOT = watchos;
+				STRING_CATALOG_GENERATE_SYMBOLS = NO;
+				SWIFT_APPROACHABLE_CONCURRENCY = YES;
+				SWIFT_EMIT_LOC_STRINGS = NO;
+				SWIFT_UPCOMING_FEATURE_MEMBER_IMPORT_VISIBILITY = YES;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = 4;
+				TEST_TARGET_NAME = "SecureStorageSample Watch App";
+				WATCHOS_DEPLOYMENT_TARGET = 10.0;
+			};
+			name = Release;
+		};
 /* End XCBuildConfiguration section */
 
 /* Begin XCConfigurationList section */
@@ -582,6 +968,33 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
+		EA65D7032F17DD6800C48466 /* Build configuration list for PBXNativeTarget "SecureStorageSample Watch App" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				EA65D7042F17DD6800C48466 /* Debug */,
+				EA65D7052F17DD6800C48466 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		EA65D7062F17DD6800C48466 /* Build configuration list for PBXNativeTarget "SecureStorageSample Watch AppTests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				EA65D7072F17DD6800C48466 /* Debug */,
+				EA65D7082F17DD6800C48466 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		EA65D7092F17DD6800C48466 /* Build configuration list for PBXNativeTarget "SecureStorageSample Watch AppUITests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				EA65D70A2F17DD6800C48466 /* Debug */,
+				EA65D70B2F17DD6800C48466 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 /* End XCConfigurationList section */
 
 /* Begin XCLocalSwiftPackageReference section */

SecureStorgageSample.xcodeproj/xcuserdata/mattbruce.xcuserdatad/xcschemes/xcschememanagement.plist

@@ -4,10 +4,25 @@
 <dict>
 	<key>SchemeUserState</key>
 	<dict>
+		<key>SecureStorageSample Watch App.xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>2</integer>
+		</dict>
+		<key>SecureStorageWatch Watch App.xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>1</integer>
+		</dict>
 		<key>SecureStorgageSample.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>0</integer>
+			<integer>1</integer>
+		</dict>
+		<key>SecureStorgageSampleWatch.xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>3</integer>
 		</dict>
 	</dict>
 </dict>

SecureStorgageSample/Models/UserProfile.swift

@@ -0,0 +1,15 @@
+import Foundation
+
+nonisolated(unsafe)
+struct UserProfile: Codable, Sendable {
+    static let storageKeyName = "user_profile.json"
+
+    let name: String
+    let email: String
+    let age: Int?
+    let createdAt: Date
+
+    var ageDescription: String {
+        age.map(String.init) ?? "n/a"
+    }
+}

SecureStorgageSample/SecureStorgageSampleApp.swift

@@ -9,6 +9,10 @@ import SwiftUI
 
 @main
 struct SecureStorgageSampleApp: App {
+    init() {
+        _ = WatchConnectivityService.shared
+    }
+
     var body: some Scene {
         WindowGroup {
             ContentView()

SecureStorgageSample/Services/WatchConnectivityService.swift

@@ -0,0 +1,35 @@
+import Foundation
+import WatchConnectivity
+
+@MainActor
+final class WatchConnectivityService: NSObject, WCSessionDelegate {
+    static let shared = WatchConnectivityService()
+
+    private override init() {
+        super.init()
+        activateIfSupported()
+    }
+
+    private func activateIfSupported() {
+        guard WCSession.isSupported() else { return }
+        let session = WCSession.default
+        session.delegate = self
+        session.activate()
+    }
+
+    func session(
+        _ session: WCSession,
+        activationDidCompleteWith activationState: WCSessionActivationState,
+        error: Error?
+    ) {
+        // Intentionally empty: activation state is handled by WCSession.
+    }
+
+    func sessionDidBecomeInactive(_ session: WCSession) {
+        // No-op; required for iOS WCSessionDelegate.
+    }
+
+    func sessionDidDeactivate(_ session: WCSession) {
+        session.activate()
+    }
+}

SecureStorgageSample/StorageKeys.swift

@@ -123,15 +123,19 @@ extension StorageKeys {
     
     /// Stores user profile as JSON file in documents.
     struct UserProfileFileKey: StorageKey {
-        typealias Value = [String: AnyCodable]
+        typealias Value = UserProfile
         
-        let name = "user_profile.json"
+        let name = UserProfile.storageKeyName
-        let domain: StorageDomain = .fileSystem(directory: .documents)
+        let domain: StorageDomain
         let security: SecurityPolicy = .none
-        let serializer: Serializer<[String: AnyCodable]> = .json
+        let serializer: Serializer<UserProfile> = .json
         let owner = "SampleApp"
-        let availability: PlatformAvailability = .phoneOnly
+        let availability: PlatformAvailability = .phoneWithWatchSync
-        let syncPolicy: SyncPolicy = .never
+        let syncPolicy: SyncPolicy = .automaticSmall
+
+        init(directory: FileDirectory = .documents) {
+            self.domain = .fileSystem(directory: directory)
+        }
     }
     
     /// Stores cached data files.
@@ -264,3 +268,4 @@ extension StorageKeys {
         let syncPolicy: SyncPolicy = .never
     }
 }
+

SecureStorgageSample/Views/FileSystemDemo.swift

@@ -12,7 +12,7 @@ struct FileSystemDemo: View {
     @State private var profileName = ""
     @State private var profileEmail = ""
     @State private var profileAge = ""
-    @State private var storedProfile: [String: AnyCodable]?
+    @State private var storedProfile: UserProfile?
     @State private var statusMessage = ""
     @State private var isLoading = false
     @State private var selectedDirectory: FileDirectory = .documents
@@ -81,9 +81,10 @@ struct FileSystemDemo: View {
             
             if let profile = storedProfile {
                 Section("Retrieved Profile") {
-                    ForEach(Array(profile.keys.sorted()), id: \.self) { key in
+                    LabeledContent("Name", value: profile.name)
-                        LabeledContent(key.capitalized, value: String(describing: profile[key]?.value ?? "nil"))
+                    LabeledContent("Email", value: profile.email)
-                    }
+                    LabeledContent("Age", value: profile.ageDescription)
+                    LabeledContent("Created", value: profile.createdAt.formatted(date: .abbreviated, time: .shortened))
                 }
             }
             
@@ -99,7 +100,7 @@ struct FileSystemDemo: View {
                 LabeledContent("Domain", value: "File System")
                 LabeledContent("Security", value: "None")
                 LabeledContent("Serializer", value: "JSON")
-                LabeledContent("Platform", value: "Phone Only")
+                LabeledContent("Platform", value: "Phone + Watch Sync")
             }
         }
         .navigationTitle("File System")
@@ -118,13 +119,13 @@ struct FileSystemDemo: View {
         isLoading = true
         Task {
             do {
-                let key = StorageKeys.UserProfileFileKey()
+                let key = StorageKeys.UserProfileFileKey(directory: selectedDirectory)
-                let profile: [String: AnyCodable] = [
+                let profile = UserProfile(
-                    "name": AnyCodable(profileName),
+                    name: profileName,
-                    "email": AnyCodable(profileEmail),
+                    email: profileEmail,
-                    "age": AnyCodable(Int(profileAge) ?? 0),
+                    age: Int(profileAge),
-                    "createdAt": AnyCodable(Date().ISO8601Format())
+                    createdAt: Date()
-                ]
+                )
                 try await StorageRouter.shared.set(profile, for: key)
                 statusMessage = "✓ Saved to \(selectedDirectory == .documents ? "Documents" : "Caches")"
             } catch {
@@ -138,7 +139,7 @@ struct FileSystemDemo: View {
         isLoading = true
         Task {
             do {
-                let key = StorageKeys.UserProfileFileKey()
+                let key = StorageKeys.UserProfileFileKey(directory: selectedDirectory)
                 storedProfile = try await StorageRouter.shared.get(key)
                 statusMessage = "✓ Loaded from file system"
             } catch StorageError.notFound {
@@ -155,7 +156,7 @@ struct FileSystemDemo: View {
         isLoading = true
         Task {
             do {
-                let key = StorageKeys.UserProfileFileKey()
+                let key = StorageKeys.UserProfileFileKey(directory: selectedDirectory)
                 try await StorageRouter.shared.remove(key)
                 storedProfile = nil
                 statusMessage = "✓ File deleted"