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Supabase vs Firebase
Both give a new app auth and data without standing up a server from scratch. Supabase is Postgres. Firebase is Google's backend platform. The scores are the directory scores.
Supabase
8.5An open-source Postgres platform with auth, storage, and APIs.
Choose Supabase when you want SQL, or you want an open-source backend you could leave later.
Official siteFirebase
8.0Google's platform for app backends, authentication, and hosting.
Choose Firebase when the app is already aimed at Google's client libraries, especially mobile.
Official site