Supabase is the open-source alternative to Firebase, built on PostgreSQL. Provides instant APIs, authentication, real-time subscriptions, file storage, and edge functions. Free tier: 500MB database, 1GB file storage, 50,000 monthly active users. The backend choice of many indie hackers and startups building on Vercel.
Pros
- Open source — no vendor lock-in | PostgreSQL is industry standard | Generous free tier | Auth, database, storage, and functions in one | Growing ecosystem
Cons
- Less mature than Firebase | Some features still in beta | Requires SQL knowledge | Migration from Firebase is complex | Self-hosting is complex
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