Imported from harshav167/build-ios-apps (skills/app-clips/SKILL.md). Install upstream with npx skills add harshav167/build-ios-apps --skill app-clips. Copyright stays with the author.

App Clips

Lightweight, instantly available versions of your iOS app for in-the-moment experiences or demos. Targets iOS 26+ / Swift 6.3 unless noted.

App Clip Target Setup
Invocation and Experience Routing
Size and Capability Decisions
Data, Notifications, and Location
Common Mistakes
Review Checklist
References

App Clip Target Setup

An App Clip is a separate target in the same Xcode project as your full app:

File → New → Target → App Clip — Xcode creates the App Clip target, adds the Embed App Clip build phase to the full app target, and wires the association entitlements.
The App Clip bundle ID must be prefixed by the full app's bundle ID: com.example.MyApp.Clip.
Verify raw entitlement keys when diagnosing archive, signing, or App Store Connect failures:
- App Clip target: com.apple.developer.on-demand-install-capable
- App Clip target parent app link: com.apple.developer.parent-application-identifiers
- Full app target associated App Clip link: com.apple.developer.associated-appclip-app-identifiers

Use Swift packages or shared source files for code needed by both targets. Add App Clip-specific compile branches with the APPCLIP active compilation condition, and avoid linking full-app-only frameworks into the App Clip target.

Invocation and Experience Routing

Read references/routing-and-experiences.md when implementing invocation URL routing, App Store Connect experiences, Local Experiences, Safari Smart App Banners, QR/NFC/App Clip Codes, AASA, or associated domains.

App Clips receive NSUserActivityTypeBrowsingWeb activities. Keep the invocation router shared with the full app because, after installation, the full app replaces the App Clip and receives future invocations.

SwiftUI: use .onContinueUserActivity(NSUserActivityTypeBrowsingWeb).
UIKit cold launch: inspect connectionOptions.userActivities in scene(_:willConnectTo:options:).
UIKit continuation: handle the actual NSUserActivity in scene(_:continue:).
scene(_:willContinueUserActivityWithType:) is only advance notice and does not provide the URL.

Configure the required default App Clip experience in App Store Connect. Use advanced experiences for Maps integration, location association, production App Clip Codes, per-location cards, and precise physical-place routing; demo App Clip Codes can use the short demo App Clip link.

For custom URLs, add appclips:example.com to Associated Domains on both the full app and App Clip targets, and host an AASA file with the App Clip app identifier. For Safari banners, use app-id, app-clip-bundle-id, and optional app-clip-display=card; do not rely on app-argument for App Clip launches.

Size and Capability Decisions

Read references/size-capabilities-and-promotion.md before feasibility reviews or capability audits, and when checking size budgets, measurement, Background Assets, SKOverlay, Live Activities App Clip extension constraints, CloudKit limits, or unsupported capabilities.

Always measure App Clip size with the App Thinning Size Report. In feasibility reviews, explicitly choose the size limit from deployment target, invocation support, and connectivity: the larger iOS 17+ limit applies to digital-only App Clips where reliable internet is likely; physical invocation or iOS 16 support uses a smaller budget; demo links can use the current 100 MB limit while supporting NFC/QR test invocations, and demo App Clip Codes require the short demo link. Apple has changed App Clip size policy over time, so re-check current App Store Connect and App Clip documentation before release-blocking size decisions.

Use Background Assets only for content that can arrive after launch without blocking the in-the-moment task, and do not mark App Clip background asset downloads as essential. Large bundled media, ML models, catalogs, or downloads that must finish before useful work are poor App Clip fits; state that required pre-task downloads are not acceptable for in-the-moment App Clips, and check download size plus whether any required download blocks useful work. Move those flows to streaming/server-backed content, post-task assets, or the full app. Show SKOverlay.AppClipConfiguration or SwiftUI appStoreOverlay only after task completion, never as a gate.

App Clips can use CloudKit public database reads on iOS 16+ with CloudKit-Anonymous, but cannot write the public database or use iCloud Documents, key-value storage, private containers, or shared containers. App Clips can offer Live Activities through an App Clip-only widget extension starting in iOS 16. That extension can include only Live Activities and needs the App Clip Extension capability; always include the raw entitlement key com.apple.developer.on-demand-install-capable when reviewing this boundary.

In feasibility reviews, explicitly name unsupported App Clip runtime features instead of summarizing them generically. Always list SKAdNetwork, App Tracking Transparency, and custom URL schemes when discussing excluded runtime features, alongside App Intents, Background Tasks, background URL sessions, in-app purchases, durable persistent local state, and background/persistent assumptions. Route detailed ActivityKit/WidgetKit Live Activity work, StoreKit purchase/full-app monetization, BackgroundTasks processing, CloudKit schema or sync beyond public reads, durable credentials, and long-term state to sibling or full-app domains without implementation detail. For product/PM feasibility reviews, stay at the App Clip boundary level: capability fit, size basis, invocation constraints, and handoff destinations. Describe location confirmation, install promotion, App Group/keychain handoff, and Live Activities conceptually. Do not add Swift package decomposition, API symbols such as APActivationPayload, CLCircularRegion, or SKOverlay.AppClipConfiguration, App Group/keychain implementation recipes, or other API-level implementation guidance unless the user asks for implementation.

Data, Notifications, and Location

Read references/data-handoff-notifications-location.md when implementing App Group/full-app migration, keychain or Sign in with Apple handoff, ephemeral notifications, notification relaunch routing, or physical location confirmation.

Use App Groups/shared containers for non-secret handoff data only. Any target provisioned with the App Group entitlement can read and write the shared container/defaults suite, so it is not a trust boundary. Do not put passwords, refresh tokens, payment credentials, or other secrets there.

Starting in iOS 15.4, the full app can access keychain items created by its corresponding App Clip only when the App Clip and full app have the correct association entitlements, including the full app's com.apple.developer.associated-appclip-app-identifiers. The App Clip cannot read keychain items created by the full app.

For Sign in with Apple handoff, store the ASAuthorizationAppleIDCredential.user identifier and have the full app verify ASAuthorizationAppleIDProvider.getCredentialState(forUserID:) == .authorized.

For ephemeral notifications, set NSAppClipRequestEphemeralUserNotification under the App Clip target's NSAppClip Info.plist dictionary. Authorization can last up to 8 hours after each launch, but users can disable it on the App Clip card, so check notification settings for .ephemeral before scheduling. Notification taps relaunch without the original invocation URL, so route multi-experience notifications with APNs target-content-id for remote notifications or UNNotificationContent.targetContentIdentifier for local notifications. Use a URL matching the relevant App Store Connect advanced App Clip experience, not an arbitrary opaque ID.

For physical-location confirmation, use NSUserActivity.appClipActivationPayload / APActivationPayload.confirmAcquired(in:) with a CLCircularRegion radius up to 500 meters, and set NSAppClipRequestLocationConfirmation under the App Clip target's NSAppClip Info.plist dictionary, not the full app's. This confirms eligible physical invocations without granting continuous location access.

Common Mistakes

Exceeding the applicable App Clip size limit

Choose the limit based on deployment target and invocation support. A physically invoked App Clip that supports iOS 16 has a much smaller budget than an iOS 17+ digital-only App Clip. Measure with the App Thinning Size Report after meaningful target changes.

Mixing up App Clip entitlement names

App Clip target:
com.apple.developer.on-demand-install-capable
com.apple.developer.parent-application-identifiers

Full app target:
com.apple.developer.associated-appclip-app-identifiers

Display names in Xcode differ from raw entitlement keys; use raw keys when debugging signing output or archived entitlements.

Treating UIKit continuation notification as URL handling

scene(_:willContinueUserActivityWithType:) does not include the NSUserActivity. Handle the URL in scene(_:willConnectTo:options:) for cold launch and scene(_:continue:) for activity continuation.

Not testing invocation URLs locally

A direct Xcode launch can skip the invocation path and hide routing bugs. Use the _XCAppClipURL scheme environment variable or register a Local Experience in Settings → Developer → Local Experiences.

Not handling the full app replacing the App Clip

Share invocation routing with the full app. After install, all future invocations go to the full app.

Storing secrets in App Group storage

Use App Groups for non-secret handoff state only. Use keychain or server-side verification for credentials.

Designing a marketing-only or web-view-heavy App Clip

App Clips should let people complete a focused task or full demo without installing the app. Avoid marketing-only clips, ad-heavy flows, splash screens, launch-blocking downloads, repeated install prompts, and web-view-heavy experiences that would work better as a website.

Missing associated domains configuration

Add appclips:example.com to Associated Domains on both the full app and App Clip targets, and host /.well-known/apple-app-site-association with the App Clip app identifier for custom URL invocations and advanced experiences.

app-clips

About

App Clips

Contents

App Clip Target Setup

Invocation and Experience Routing

Size and Capability Decisions

Data, Notifications, and Location

Common Mistakes

Exceeding the applicable App Clip size limit

Mixing up App Clip entitlement names

Treating UIKit continuation notification as URL handling

Not testing invocation URLs locally

Not handling the full app replacing the App Clip

Storing secrets in App Group storage

Designing a marketing-only or web-view-heavy App Clip

Missing associated domains configuration

Review Checklist

References

Use it

Manifest

Reviews