I submitted the homepage for Replicache earlier this year, when it was just a landing page:
The commentary I received at the time was basically “interesting claims, but not much to see yet”.
I’m posting again to share that Replicache is now available in beta for web applications.
We are licensing it using the Business Source License (ala CockroachDB) and you can peruse the source here: https://github.com/rocicorp/repc.
The detailed design doc is here: https://github.com/rocicorp/replicache/blob/master/design.md.
For more information, see https://replicache.dev.
Or to just try it out right now, see https://js.replicache.dev.