Supabase is an open-source backend-as-a-service platform that positions itself as an alternative to Firebase. The key difference is that Supabase is built on PostgreSQL — a real, full-featured relational database — rather than a proprietary NoSQL store. This means you get all the power of SQL, foreign keys, joins, and the PostgreSQL extension ecosystem, while still benefiting from the managed infrastructure and developer-friendly APIs that make BaaS platforms appealing.
The platform bundles several services: a PostgreSQL database, authentication, file storage, edge functions, and real-time subscriptions. Each service is accessible via auto-generated REST and GraphQL APIs, or through official client libraries for JavaScript, Python, Flutter, and other languages.
Supabase is well-suited for applications that need a relational data model but want to avoid the overhead of setting up and managing a database server. SaaS applications, internal tools, and mobile app backends are all common use cases.
The row-level security feature is particularly valuable for multi-tenant applications. You can define policies that ensure users can only access their own data at the database level, rather than relying on application-layer checks that can be bypassed.
For teams migrating away from Firebase, Supabase provides a more familiar SQL-based data model and avoids the vendor lock-in concerns associated with proprietary NoSQL databases.
Free tier includes 2 projects with 500MB database storage. Pro plan at $25/month per project adds more storage, backups, and higher usage limits. Team and Enterprise plans for larger organizations.