On a high level, it solves a similar problem: a full backend so you mostly only have to write a frontend.

But Jazz does so in a completely different (local-first) way: it implements shared state on top of CRDTs and implements user identity and permissions based on public-key cryptography. This means you can create, store and share data from the client (even while offline) while still benefitting from cloud storage and real-time sync between devices and users by default.