Open-source Firebase alternative with PostgreSQL, auth, storage, and realtime.
Supabase gives you a real Postgres database with auth, storage, and realtime subscriptions out of the box. It is what Firebase should have been. The free tier is generous enough for side projects, and the local dev experience with the CLI is excellent.
Supabase has established itself as the leading open-source alternative to Firebase, and it does so by offering something Firebase never could: a real PostgreSQL database with full relational capabilities. This is not a proprietary NoSQL store with limitations — it is PostgreSQL, the world's most advanced open-source database, exposed through a modern API layer.
Supabase bundles several critical backend services: a PostgreSQL database with real-time capabilities, authentication (email, OAuth, magic links, phone), storage for file uploads with CDN delivery, and Edge Functions for server-side logic. Each component works standalone but integrates seamlessly with the others.
The authentication system deserves special mention. It handles the complex parts of user management with minimal configuration. The integration with PostgreSQL's Row Level Security means your data access policies live in the database, not in application code. The local development experience via the Supabase CLI is excellent. The free tier is generous enough for side projects and MVPs.
I built a full-stack app on Supabase in what felt like record time. The Postgres foundation meant I could write real SQL queries with JOINs, transactions, and constraints — no fighting with NoSQL data modeling tradeoffs. Auth setup took about 20 minutes: Google OAuth, magic link login, and RLS policies restricting users to their own data. The Realtime feature was magical for a collaborative document editor — changes appeared instantly across browsers without any custom signaling code. When I hit limits, the self-hosting option using Docker Compose gave me a clear escape hatch. The main friction point was RLS: getting policies right for complex permission models required more iteration than I expected, and the error messages when a query is blocked by RLS are not always intuitive about which policy failed.
If your team has deep Firebase expertise and existing infrastructure, the migration cost may not be worth it. Apps requiring extremely low-latency global reads at massive scale may hit connection pooling limits sooner than expected.
Supabase is the backend-as-a-service that developers have been waiting for — real PostgreSQL with auth, storage, and realtime out of the box. It is what Firebase should have been.