> Using Zero is another option, it has many similarities to Electric, while also directly supporting mutations.

The core differentiator of Zero is actually query-driven sync. We apparently need to make this more clear.

You build your app out of queries. You don't have to decide or configure what to sync up front. You can sync as much, or as little as you want, just by deciding which queries to run.

If Zero does not have the data that it needs on the client, queries automatically fall back to the server. Then that data is synced, and available for next query.

This ends up being really useful for:

- Any reasonably sized app. You can't sync all data to client.

- Fast startup. Most apps have publicly visible views that they want to load fast.

- Permissions. Zero doesn't require you to express your permissions in some separate system, you just use queries.

So the experience of using Zero is actually much closer to a reactive db, something like Convex or RethinkDB ().

Except that it uses standard Postgres, and you also get the instant interactions of a sync engine.