Guide to building offline-first Capacitor apps with data synchronization, caching strategies, and conflict resolution. Covers Fast SQL, service workers, and network detection. Use this skill when users need their app to work without internet.

Offline First Capacitor Apps Build apps that work seamlessly with or without internet connectivity. When to Use This Skill User needs offline support User asks about data sync User wants caching User needs local database User has connectivity issues Offline First Architecture Network Detection Using Capacitor Network Plugin Network Aware Service Local Database with Fast SQL Installation Before using Fast SQL in production, complete the required platform setup: iOS: allow localhost networking for the plugin transport. Android: add the localhost cleartext exception required by the plugin. Web: install sql.js if the app needs the web fallback. Use the dedicated sqlite to fast sql skill when you need the full platform checklist. Database Setup Offline Data Repository Sync Manager Service Worker Caching Register Service Worker Service Worker with Workbox Optimistic UI Updates Queue Failed Requests Best Practices 1. Show Sync Status 2. Handle Conflicts Gracefully 3. Validate Before Sync Resources Capacitor Network: https://capacitorjs.com/docs/apis/network Workbox: https://developer.chrome.com/docs/workbox IndexedDB: https://developer.mozilla.org/docs/Web/API/IndexedDB API Offline First Manifesto: http://offlinefirst.org

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