Aruma is an open-source (Apache 2.0) backend that works with the official Firebase SDKs. Run it on your own server: one Go binary + PostgreSQL with a built-in dashboard.
It serves Auth, Realtime Database, Cloud Storage, Security Rules and a Firestore-compatible database. For Auth, RTDB and Firestore you change the config file, not your app code. Storage on iOS/Flutter needs a small helper.
Pre-1.0 (v0.4.0). Try it with docker compose or a binary from Releases.
