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Supabase is an open-source Firebase alternative that provides a complete backend-as-a-service platform. It offers PostgreSQL database, authentication, real-time subscriptions, edge functions, and file storage with a developer-friendly dashboard and auto-generated APIs.

Appwrite is an end-to-end backend server for web, native, and mobile developers. It provides a complete backend-as-a-service platform with authentication, databases, file storage, cloud functions, and real-time capabilities, all accessible through REST APIs and SDKs.

Firebase is a mobile and web application development platform that provides a suite of tools for building and scaling applications. It provides a fully managed service with features like data storage, real-time database, authentication, and hosting.