Convex

Say you want a chat app where messages show up on every screen the moment someone hits send. Convex handles that kind of job: it is a full-stack TypeScript platform with a realtime database, so your frontend stays in sync with your data without you wiring up polling or sockets yourself.

Backend functions, data storage and synchronization live under one roof, and you write all of it in TypeScript.

Convex is also open source and can be self-hosted, which matters if you do not want to depend on a single vendor's cloud.

It includes AI-assisted code generation as an AI developer tool, so you can have it help draft backend logic and queries.

Convex is a newer platform than established options like Firebase, so the community and track record are smaller.

You will need to learn Convex-specific concepts and APIs before you are productive, and that is a real cost if your team already knows another backend.

Pricing can grow as your usage grows, so check the numbers before you commit a larger app to it.