Tanstack DB - a new client side store for web apps, with transactions, optimistic state, and live queries spanning multiple collections.

It's designed for sync, so rather than fetching you can hook it up to a sync engine (any!) to keep your front end in sync with your backend. It's built on Tanstack Query, making the sync engine optional, and a great path for incremental adoption.

The query engine uses a typescript implementation of differential dataflow to enable incremental computation of the live queries - they are very fast to update. This gives you sub ms fine grade reactivity of complex queries (think sql like joins, group by etc).

Having a lot of fun building it!

https://tanstack.com/db/latest https://github.com/TanStack/db