Supabase is an open-source Firebase alternative. It provides a set of tools and services that allow developers to build and scale web and mobile applications quickly and easily. Supabase includes features such as a PostgreSQL database, real-time data synchronization, authentication, storage, and more. It is designed to be a secure and reliable platform for building modern applications. Supabase is built on top of PostgreSQL, which is a highly scalable and reliable database. It also offers a number of tools and services that make it easy to build and manage applications.