How to build an offline-first app using Expo & Legend State
Blog post from Expo
Callum Hemsley, a tech lead at Theodo and organizer of React Native London, discusses the development of an offline-first expenses tracker app using Legend State and Expo. Emphasizing the benefits of a local-first approach to counter connectivity issues in app development, the app enables users to add expenses from any device, syncing data locally and uploading to the cloud once online for seamless updates. Hemsley highlights the distinction between offline-first and local-first technologies, where offline-first preserves changes made offline for later synchronization, and local-first prioritizes local data as the primary source of truth. Throughout the development process, Legend State's offline-first capabilities, along with Expo's support, allow for efficient data persistence and remote synchronization using Firebase Realtime Database. The app's performance is tested under various scenarios, demonstrating effective real-time syncing upon reconnection. While challenges remain in data ownership and privacy, the project showcases the potential of local-first apps in providing user-friendly, anytime-anywhere functionality, encouraging exploration of the local-first movement.
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