An Object Sync Engine for Local-first Apps

The discussion centers on the development and functionality of object sync engines for local-first web applications, which prioritize user experience by enabling apps to function smoothly offline with real-time data synchronization. The text highlights the efforts of various companies like Linear, Figma, and Asana in creating their own object sync engines, while introducing Convex's initiative to build a versatile engine. Object sync engines operate by synchronizing an object graph between local storage and a centralized server, allowing apps to read and write data at high speeds without network dependency. The engines entail a local store, a server store, and a sync protocol, each requiring programmability to adapt to the app’s specific needs. Convex's approach utilizes IndexedDB and plans to incorporate SQLite for cross-platform compatibility, offering developers the ability to specify local schemas that can diverge from server schemas, ensuring effective data handling and user interface updates. The sync protocol is crucial for managing data consistency, enabling initial and incremental data synchronization between the client and server, and handling mutations efficiently. As the engine matures, Convex aims to provide robust offline support and programmable server interactions, striving to balance local-first application performance with centralized server reliability.

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