y-sweet: a Yjs server with persistence and auth

y-sweet is an open-source server for building realtime applications on top of the Yjs CRDT library.

Features

• Persists document data to a network filesystem or S3-compatible storage, inspired by Figma’s infrastructure.
• Scales horizontally with a session backend model.
• Deploys as a native Linux process, or as a WebAssembly module on Cloudflare's edge.
• Provides document-level access control via client tokens.
• Written in Rust with a focus on stability and performance, building on the excellent y-crdt library.