Supabase vs Firebase

Q: Which is better for for data that fits a relational model — Supabase or Firebase?

Supabase wins. Joins, indexes, foreign keys, transactions — all the reasons SQL exists. Firestore's document model forces denormalization. After 3 years on Firebase teams realize their data model has become unmaintainable.

Q: Which is better for for mobile-first products with realtime sync — Supabase or Firebase?

Firebase wins. Firebase's iOS/Android/Flutter SDKs are still the platform standard. Realtime sync, offline-first, push notifications all in one SDK. For mobile-primary apps the maturity gap with Supabase is real.

Q: Which is better for for self-host / data residency — Supabase or Firebase?

Supabase wins. Supabase is open-source and self-hostable. Firebase has no equivalent path. For regulated industries or compliance-heavy customers, this is decisive.

A side-by-side comparison from 117 GitHub-verified developers who shipped production code on both platforms.

TL;DR — The Verdict

Supabase wins on data model (Postgres) and self-host option; Firebase wins on mobile SDKs and realtime sync maturity. For mobile-first products Firebase; for everything else Supabase has caught up and pulled ahead.

Benchmark Comparison

Metric	Supabase	Firebase
Database model	Postgres (SQL)	Firestore (NoSQL)
Mobile SDKs (iOS/Android)	Mature	Best-in-class
Realtime maturity	Strong	Best-in-class
Self-host option	Yes (OSS)	No
RLS / row-level security	Native	Rules language
Migration off platform	Standard Postgres	Genuinely painful
Auth providers	Major social + SAML	All major social
Free tier	500MB	Generous Spark

Operational Verdicts

For data that fits a relational model

Supabase wins

Joins, indexes, foreign keys, transactions — all the reasons SQL exists. Firestore's document model forces denormalization. After 3 years on Firebase teams realize their data model has become unmaintainable.

For mobile-first products with realtime sync

Firebase wins

Firebase's iOS/Android/Flutter SDKs are still the platform standard. Realtime sync, offline-first, push notifications all in one SDK. For mobile-primary apps the maturity gap with Supabase is real.

For self-host / data residency

Supabase wins

Supabase is open-source and self-hostable. Firebase has no equivalent path. For regulated industries or compliance-heavy customers, this is decisive.

Reviewer Voices

Pro Supabase

"The cohesive Postgres-on-edge platform."

— @fullstack_lead · Tech Lead

"Postgres is the moat. Everything else is convenient packaging."

— @sql_native · Senior Engineer

Pro Firebase

"Mobile-first BaaS still the default for a reason."

— @mobile_dev · iOS Engineer

"Unity SDK is why I stay."

— @unity_dev · Game Developer

Methodology

How GitShowcase ranks tools and constructs comparisons →