stac

Stac is a backend-as-a-service built specifically for the Dart ecosystem. Think Firebase or Supabase but written in Dart, so your entire stack speaks the same language.

Free and open source under MIT. You self-host it and get auth, a database layer, file storage, and serverless functions. The Dart-native angle means you write backend logic in the same language as your Flutter frontend, no context-switching between TypeScript and Dart.

The catch: this is very early. The Dart backend ecosystem is tiny compared to Node.js or Python. If Stac's development stalls, you're stranded on a niche framework with limited community support. Firebase and Supabase have massive communities, extensive documentation, and proven scale. Stac's only real advantage is the all-Dart stack, and that only matters if Dart-everywhere is a priority for your team.