Both convex and Instant let you build apps quickly without worrying about the backend. Where Instant differs, is that queries and transactions can run on the client: you get optimistic updates and offline mode by default. On the other hand, convex lets you define queries as functions that can run on the edge. I haven't used convex deeply, but this is my understanding.

Thank you so much! I’m a first time builder of a bigger CRUD app. While I’m happy to build it with traditional methods the first time (REST API, SSE, auth etc.) I would love to use offers like Instant or Convex in my next projects.

Both look really promising in my opinion.

(Edited for typos)