Supabase is an open-source backend platform that provides common application infrastructure such as a PostgreSQL database, authentication, file storage, realtime updates, edge functions, and APIs. It is often used as an alternative to building these backend components separately, allowing developers to create full-stack applications around a managed or self-hosted Postgres foundation.

The project includes official client libraries for JavaScript, Flutter, Swift, Python, and other ecosystems, along with community integrations. Supabase is useful for web and mobile teams that want to move quickly while keeping direct access to SQL and PostgreSQL, and it can also serve as the data and authentication layer behind AI applications, agents, and retrieval systems.