Data model. Supabase centers on PostgreSQL and relational data. Firebase commonly centers on document-oriented Firestore for application data.
Platform services.
Both provide authentication, storage and server-side capabilities, but their APIs, local tooling and hosting assumptions differ.
Both platforms reduce backend setup, but the data model, ecosystem and operational preferences can make one a much better fit.
Choose around the product.
Relational reporting and SQL-heavy products often fit Supabase naturally; realtime document workflows and Google ecosystem integration may favor Firebase.
Avoid feature-count comparisons.
The best choice depends on data shape, team skills, hosting constraints, expected scale and how much platform lock-in you are comfortable with.