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SyncKit

lastmod 2026-09-02created 2025-12-162 edits

A type-safe sync engine for real-time collaborative apps

About

  • A production-grade sync engine developed to reduce the complexity of building local-first applications
  • CRDT-based, supporting automatic sync and conflict resolution even offline with just three lines of code
  • A lightweight engine made up of a WASM-based Rust core and a TypeScript SDK (~59KB, Lite version ~45KB)
  • An offline-first architecture rather than simple caching, keeping full functionality without a network connection (uses IndexedDB-based local storage)
  • Built-in real-time collaboration: supports instant sync between devices over WebSocket and cross-tab sync between browser tabs
  • Automatic conflict resolution using Last-Write-Wins (LWW)
  • Performance-focused design: local operations under 1ms, network sync under 100ms
  • React integration support: provides React Hooks such as useSyncDocument and SyncProvider
  • Includes a Bun + Hono reference implementation that integrates with a TypeScript server
  • Planned future features (v0.2.0)
    • Character-level collaborative editing based on Text CRDTs
    • Additional distributed data structures such as Counters and Sets
    • Framework adapters for Vue and Svelte and multi-language server implementations (Python/Go/Rust) planned
  • Comparison with other frameworks
    • Compared with Firebase: full offline support and unlimited storage
    • Compared with Supabase: genuinely working offline behavior
    • Compared with Yjs: a simple structured data API and multi-language server compatibility
    • Compared with Automerge: smaller bundle size and faster performance
  • Main use cases
    • Simple object sync apps such as task management, notes, and CRM
    • Collaborative document editors and project management tools
    • Custom CRDT-based apps such as whiteboards and design tools
  • MIT license

See also

  • Collaboration Platform
  • Colyseus - Multiplayer Framework for Node.js
  • PartyKit - A platform for building real-time collaborative apps
  • SyncKit - A type-safe sync engine for real-time collaborative apps
  • LiveKit - An open-source real-time communication platform
  • SpacetimeDB - A DB for building multiplayer games/apps
  • Instant – A backend platform for AI-written apps
  • Triplit - An open-source DB that syncs between server and browser in real time

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