Open-source Firebase alternative built on Postgres. Provides real-time databases, authentication, and vector storage for startups building without vendor lock-in.
Supabase is an open-source backend-as-a-service (BaaS) platform that replaces Firebase with a Postgres-native architecture. It combines a managed PostgreSQL database, real-time subscriptions, authentication, file storage, and vector embeddings into a single platform designed for developers who want production-grade infrastructure without proprietary constraints. For startup builders, Supabase solves a specific problem: Firebase's pricing and feature limitations become painful at scale, and building your own backend infrastructure requires DevOps expertise most early teams lack. Supabase sits between these extremes—it's open source (you can self-host), but also offers a managed cloud service with predictable pricing tied to database usage rather than API calls. Core capabilities include PostgreSQL as the primary data layer (not a proprietary NoSQL store), real-time subscriptions via WebSockets, built-in JWT authentication with social login providers, file storage via S3-compatible buckets, and vector search for AI/ML applications. The platform exposes a REST API and JavaScript/Python client libraries automatically generated from your schema. Key operator decisions: Supabase's Postgres foundation means you get SQL, complex queries, and relational data modeling—advantages if your product needs structured data. The real-time layer works through database triggers and replication, not a separate event bus. Authentication is handled via their Auth service, which supports email/password, OAuth, and passwordless flows. Vector storage (verify on vendor site for current feature set) enables semantic search and AI integrations without external dependencies. Pricing is usage-based: free tier includes 500 MB database, 1 GB file storage, and limited API calls; paid plans scale with database size and egress. Self-hosting is possible but requires Kubernetes or Docker expertise. The open-source model means you're not locked into their managed service—a significant advantage for teams planning long-term control. Limitations include: the real-time feature set is narrower than Firebase's (verify current capabilities), the ecosystem of third-party integrations is smaller than Firebase's, and self-hosting requires operational overhead. Postgres expertise helps but isn't required for basic usage.