Replicache
Local-first sync framework that works with any backend database. Replicache maintains a local data store in the browser, applies mutations optimistically, and syncs with your server using a pull/push model. Unlike Triplit (provides full database), Replicache is a sync framework — bring your own backend (any DB) and implement the sync protocol. Enables instant UI updates with eventual consistency. Used by Figma's multiplayer foundation.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Auth delegated to your server — security depends on server implementation quality. Client data stored in IndexedDB — same-origin protection applies. BSL 1.1 licensed.
⚡ Reliability
Best When
You need local-first architecture with your existing backend — Replicache is backend-agnostic and adds real-time sync on top of any database.
Avoid When
You want a complete local-first database solution — use Triplit or ElectricSQL. Replicache requires server-side implementation of sync endpoints.
Use Cases
- • Add optimistic updates and offline capability to React applications with any existing backend database
- • Build multiplayer collaborative applications where all users see real-time updates via Replicache's poke/push model
- • Implement local-first architecture on top of existing PostgreSQL or DynamoDB backends without migrating to a new database
- • Enable offline-capable agent frontends that queue mutations and sync when connectivity returns
- • Build instant-responsive UIs where mutations apply locally before server confirmation
Not For
- • Simple CRUD apps without multiplayer or offline needs — adds significant complexity for simple use cases
- • Teams without backend development capacity — Replicache requires implementing server-side push/pull endpoints
- • Non-browser environments — Replicache's client is browser-focused; server-side use is limited
Interface
Authentication
Auth handled by your server — Replicache passes auth tokens to your pull/push endpoints. No built-in auth.
Pricing
BSL 1.1 licensed — free for development and non-commercial use. Production SaaS use requires license from Rocicorp. Check current licensing terms.
Agent Metadata
Known Gotchas
- ⚠ Replicache requires implementing server-side pull and push endpoints — significant backend work before using the client library; not a drop-in solution
- ⚠ BSL 1.1 license — commercial SaaS use may require a paid license; verify licensing terms with Rocicorp for your use case
- ⚠ Conflict resolution is application logic — Replicache provides the framework but your mutation logic must handle conflicts correctly
- ⚠ Cookie-based authentication requires special setup — Replicache uses fetch; cookie auth needs credentials: 'include' configuration
- ⚠ The canonical tutorial (todo app) is the best starting point — Replicache's architecture requires understanding before using; don't skip the docs
- ⚠ Poke endpoint required for real-time — Replicache needs a server-sent event or WebSocket endpoint to notify clients of updates; polling fallback available
Alternatives
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Scores are editorial opinions as of 2026-03-07.