1 Best Open Source Firebase Alternatives

Firebase is Google's backend-as-a-service platform, bundling a NoSQL database, authentication, file storage, hosting, and serverless functions into one product. It is popular for building apps quickly without managing your own backend infrastructure, with client SDKs for web, iOS, and Android that handle syncing and offline support.

Developers look for open-source alternatives to Firebase for a few recurring reasons. Firestore's pricing model, based on document reads and writes, can become expensive and hard to predict as usage grows. Firebase's NoSQL data model also makes complex queries and relational data harder to model than in a SQL database. Some teams also want to avoid being tied to Google Cloud, or want the option to self-host their backend entirely.

Supabase is the most direct open-source alternative, built around a hosted or self-hosted Postgres database rather than a NoSQL store, along with authentication, file storage, and auto-generated APIs that cover much of the same ground as Firebase. Because it uses standard Postgres, it supports relational data, SQL queries, and row-level security policies, which appeals to developers who prefer a traditional relational database over Firestore's document model.

Before switching, consider that moving from Firestore to Postgres means rethinking your data model from a document structure to relational tables, which is not a mechanical migration for most apps. Check that Supabase's client SDKs support your platform and cover the real-time and offline features you rely on in Firebase, since implementations differ between the two. Also decide whether you want Supabase's hosted service or a self-hosted deployment, since each has different operational tradeoffs around cost and control.