We’ve been working on TanStack DB, an embedded, reactive client database for TanStack Query, and are proud to announce today that with the 0.1 release that it's now in BETA!

TanStack DB plugs into your existing TanStack Query useQuery calls and uses Differential Dataflow to incrementally recompute only what changed, so updates stay sub-millisecond even with 100k rows. You get live queries, optimistic updates with automatic rollback, and streaming joins — all in the client!

TanStack DB works with REST, GraphQL, WebSockets, and shines with sync engines like ElectricSQL or Firebase, letting you load large, normalized collections once and stream real-time changes into the client without manual bookkeeping. It sits on top of queryClient so you can adopt it incrementally, one route at a time.

- Intro post: https://tanstack.com/blog/tanstack-db-0.1-the-embedded-clien...

- Local-first sync via Electric: https://electric-sql.com/blog/2025/07/29/local-first-sync-wi...

- Web starter with TanStack Start: https://github.com/electric-sql/electric/tree/main/examples/...

- Mobile starter with Expo: https://github.com/electric-sql/electric/tree/main/examples/...

- Project website and docs: https://tanstack.com/db

- GitHub repo: https://github.com/tanstack/db

Try it out and let us know what you think!