We put Zero to the test by building an offline-first app with live database synchronization. It delivers on speed and developer experience but comes with some notable limitations.

marmelab

Rocicorp introduced Zero, a new general-purpose sync engine for the web, which promises instant response times for most user interactions. Zero consists of a server-side cache system and a client-side JavaScript library, facilitating fast queries, offline usage, and real-time synchronization. Despite being in alpha, Zero's architecture and features, such as local caching and use of WebSockets for live updates, show promise. However, its limitations, including support only for Postgres and lack of conflict resolution, highlight areas for improvement. A demo app and a practical example with a basic CRM app detail Zero's capabilities and setup process.

Testing Zero: Rocicorp's Ultra-Fast Sync Engine for the Web