Firebase vs Supabase in 2026. The honest side-by-side a startup CTO can act on.
Independent comparison written by senior engineers who've shipped 34 Firebase apps and 22 Supabase apps. Auth, DB, storage, functions, pricing, and the specific projects each one wins.
What is firebase vs supabase?
Firebase (Google) and Supabase (independent, open-source) are both backend-as-a-service platforms offering auth, database, storage, and serverless functions. In 2026, Firebase's database is Firestore (NoSQL, event-driven) and Supabase's is PostgreSQL (relational, SQL). Firebase wins on: mobile SDK maturity, real-time offline sync, and Google-ecosystem integration. Supabase wins on: SQL power, portability (you can lift-and-shift to any Postgres host), and cost predictability at scale. Pick Firebase for mobile-first apps with heavy offline requirements. Pick Supabase for anything relational, anything you'll want to export off later, or anything where Firestore's billing surprises would hurt.
What you get, every engagement.
Database model
Firebase: Firestore, NoSQL, document-oriented, no joins. Supabase: PostgreSQL, relational, full SQL, foreign keys, joins, triggers, row-level security. If you know your data will grow relations, Supabase wins.
Auth
Firebase Auth: mature, 30+ providers, real-time state. Supabase Auth (GoTrue): mature, 20+ providers, JWT-native, RLS-integrated. Both production-ready in 2026.
Lock-in + portability
Firebase: locked to Google Cloud. Firestore queries are proprietary. Supabase: it's just PostgreSQL — you can lift the DB to any Postgres host in an afternoon.
Pricing at scale
Firebase: per-read + per-write + per-function-invocation. Surprises are common when a chatty UI ramps traffic. Supabase: per-compute-tier + fixed egress. More predictable at scale.
The firebase vs supabase engagement, week by week.
- 01
You're building mobile-first. You need real-time offline sync. You're happy on Google Cloud long-term. Your team knows NoSQL patterns.
Pick Firebase when. You're building mobile-first. You need real-time offline sync. You're happy on Google Cloud long-term. Your team knows NoSQL patterns.
- 02
You want SQL joins + foreign keys. You want to keep the option to lift-and-shift off. You want row-level security enforced in the DB, not the app.
Pick Supabase when. You want SQL joins + foreign keys. You want to keep the option to lift-and-shift off. You want row-level security enforced in the DB, not the app.
- 03
Firestore → Postgres is a data-model rewrite (documents → tables + joins). Postgres → Firestore is almost always a mistake. Budget 8-12 weeks + a schema-redesign week.
Migrating between them. Firestore → Postgres is a data-model rewrite (documents → tables + joins). Postgres → Firestore is almost always a mistake. Budget 8-12 weeks + a schema-redesign week.
- 04
We've shipped one production hybrid: Supabase for the relational core, Firebase for the mobile offline sync layer only. It works but doubles your ops surface. Only reach for it with clear reason.
Hybrid (both)?. We've shipped one production hybrid: Supabase for the relational core, Firebase for the mobile offline sync layer only. It works but doubles your ops surface. Only reach for it with clear reason.
Questions we get about firebase vs supabase, with real answers.
Depends on traffic pattern. Below ~50K DAU, Firebase's free tier + spark plan is usually cheaper than Supabase's smallest paid tier. Above ~500K DAU, Supabase is meaningfully cheaper because Firestore's per-read pricing scales linearly while Supabase's compute-tier pricing scales in steps. Real numbers depend on your read/write mix.
Firebase's Firestore is NoSQL. You can't write SQL against it. If you want SQL, use Supabase (PostgreSQL) or Firebase's newer Data Connect product (which sits on Cloud SQL for PostgreSQL) — Data Connect is a legitimate 2026 option but younger + less proven than Supabase.
For most use cases, yes. Supabase Realtime uses Postgres logical replication + WebSockets and handles typical SaaS real-time (presence, notifications, live cursors) well. Firestore has the edge for mobile offline sync — its offline persistence is more mature. If offline-first is critical, Firebase still wins.
Supabase, easily. It's just PostgreSQL under the hood — you can `pg_dump` and move to AWS RDS, Neon, Fly.io Postgres, or any managed Postgres in an afternoon. Firebase is proprietary end-to-end and migrating off Firestore is a rewrite. If long-term portability matters, Supabase.
Supabase has row-level security enforced by PostgreSQL itself — policies live in the DB. Firebase has Security Rules, a proprietary DSL. Postgres RLS is more powerful and more portable. Firebase Rules are easier to write for simple cases but harder to reason about at scale.
Supabase, yes — the whole stack is open-source and Docker-composable. Firebase, no — it's Google Cloud only. If self-hosting is a hard requirement (regulated data, air-gapped deploy), Supabase is your only option in this pair.
Send a 5-line brief. That's it.
Tell us your team's DB experience, your data model (relational or document-heavy), your traffic estimate, and any regulatory constraint. Mohit replies inside 24 hours with a recommendation.