Supabase

Supabase gives you a full backend built on top of Postgres. You get a database with a REST and GraphQL API auto-generated from your schema, built-in auth with social providers, real-time subscriptions via websockets, file storage, and edge functions for serverless compute. The pgvector extension makes it a natural choice for AI applications that need vector similarity search alongside traditional relational data. The local development experience uses Docker to run the entire stack on your machine, and the CLI handles migrations and type generation. Supabase pairs exceptionally well with AI app builders like Lovable and Bolt, which use it as their default backend. The free tier includes 500MB database storage, 1GB file storage, and 50K monthly active users.