InstantDB

InstantDB is a backend-as-a-service that provides a complete suite of features including authentication, database, storage, and real-time capabilities in a single SDK, enabling rapid full-stack app development. It is 100% open source with a generous free tier, designed to work seamlessly with AI tools for both prototyping and production applications. Developers can start quickly using CLI commands or integrate it into AI prompts for agentic development.