Supabase

supabase.com

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Open-source Firebase alternative — Postgres database, authentication, storage, and realtime subscriptions bundled into one backend platform.

Why it is useful

Supabase gives developers a full backend (database, auth, file storage, edge functions) built on standard Postgres instead of Firebase's proprietary NoSQL store, which avoids vendor lock-in and lets teams query data with normal SQL. It's self-hostable via Docker or usable as a managed cloud service with a generous free tier.