Epicenter

Epicenter is a free, open-source framework and application ecosystem designed for building local-first software with user-controlled data storage. It uses conflict-free replicated data types through Yjs to synchronize information between devices without relying on a central database. Each application stores its data locally, allowing users to continue working without an internet connection. Its architecture supports structured tables, key-value storage, and rich text within unified data stores. Developers can define application schemas and access local data through synchronous interfaces. Epicenter also supports synchronization between devices while preserving independent local copies. Its ecosystem includes Honeycrisp, a note-taking application demonstrating the framework's offline-first capabilities.