Supabase vs Firebase in 2026: SQL Freedom or Real-Time Maturity?

Supabase and Firebase both promise "a backend without running a backend". They get there in very different ways, and picking the wrong one is expensive to undo.

The 30-second version:

The real difference: the data model

Supabase runs on Postgres, a relational SQL database. If your data has clear relationships (users, orders, line items), you get joins, constraints and SQL you already know.

Firebase uses Firestore, a NoSQL document database. It suits flexible, denormalised structures and shines when the shape of your data changes often.

Real-time and mobile

This is Firebase's home turf. Real-time sync is one of its original core strengths and is highly mature, and its native iOS and Android SDKs are deep. Supabase's real-time is functional but less established. If you're building a mobile-first app that lives on live data, Firebase still has the edge.

Lock-in and exit paths

Supabase is open source and can be self-hosted, so you have a way out if pricing or policy changes. Firebase is fully proprietary with no comparable exit option.

One practical gotcha: Supabase free-tier projects pause after 7 days of inactivity, so keep that in mind for side projects and demos.

So which one?

• Relational data, web-first or full-stack app, want an open-source exit path: Supabase.
• Native mobile app, deep SDK integration, mature real-time sync, fine with NoSQL and lock-in: Firebase.

The full table, scores and FAQ: Supabase vs Firebase — full breakdown.