How to Migrate a Flutter App from Firebase to Supabase (Step-by-Step 2026)
Open-source, Postgres SQL, lower cost at scale, GDPR compliance, handled end-to-end by App Studio.
Migrating a Flutter app from Firebase to Supabase
Most of the migrations we run are Flutter or FlutterFlow apps, and the work always comes down to the same four layers:
Auth migration
We export your Firebase Auth users with the Firebase CLI, password hashes included, and import them into Supabase Auth with the matching hash parameters, so nobody has to reset a password. Existing Firebase UIDs are kept as a mapping column, so every record keeps its owner.
Firestore → Postgres data model
Firestore collections and nested documents become proper Postgres tables with foreign keys, and subcollections become child tables. Your Firestore security rules are rewritten as row-level security policies, stricter and testable in SQL.
Flutter / FlutterFlow SDK swap
In hand-coded Flutter, firebase_core, firebase_auth, and cloud_firestore are replaced with the supabase_flutter package and queries are re-bound. In FlutterFlow, we switch the project backend to Supabase and re-map each page's queries and actions.
Realtime & functions
Firestore snapshot listeners are replaced with Supabase Realtime streams on the equivalent tables, and Cloud Functions move to Supabase Edge Functions. Push notifications via FCM keep working, they are independent of the database.
Why migrate from Firebase to Supabase?
Teams on Firebase migrate to Supabase for open-source, Postgres SQL, lower cost at scale, GDPR compliance, and App Studio has run this exact migration multiple times. Here is why it is worth the switch:
- ✓Open-source, the primary driver most teams cite when leaving Firebase.
- ✓Postgres SQL, something Firebase simply cannot provide at scale.
- ✓Lower cost at scale, GDPR compliance, all achievable within the Supabase ecosystem from day one.
What changes in the Firebase → Supabase migration
Data layer
Your existing Firebase data is exported, cleaned, and imported into Supabase. We validate every record and run reconciliation checks before go-live.
UI & frontend
Screens are rebuilt in Supabase from your existing designs or Figma files. We match pixel-perfect fidelity while adopting Supabase's component model.
Integrations
Third-party connections (APIs, webhooks, auth providers, payment gateways) are re-wired and tested in the Supabase environment with the same or better coverage.
Testing & QA
Every user journey is regression-tested against the original Firebase behaviour. We run parallel environments until you are confident to cut over.
How we migrate from Firebase to Supabase
Our 4-phase process eliminates risk, keeps your live Firebase app running throughout, and delivers a fully tested Supabase build before you cut over.
Audit
We map every feature, data model, integration, and custom logic in your Firebase app. Nothing gets missed before we start building.
Map
We produce a feature-by-feature migration plan, what maps directly to Supabase, what needs redesign, and what can be simplified or removed.
Rebuild
We build the Supabase version in weekly sprints alongside your live Firebase app. You demo and approve each module before we move on.
Launch
We run a final data sync, flip DNS or routing, and monitor for 48 hours post-launch. Full documentation and handover included.
Firebase → Supabase migration timeline & cost
Typical breakdown for a medium-effort migration. Medium effort migrations start from €7,000, we send a fixed quote after the free scoping call.
| Phase | Duration | Deliverable |
|---|---|---|
| Audit & discovery | 1 week | Migration plan + feature map |
| Rebuild & integrate | 2–4 weeks | Working Supabase app in staging |
| Testing & QA | 1 week | Regression report + sign-off |
| Launch & handover | 3–5 days | Live on Supabase, docs delivered |
Firebase to Supabase, frequently asked questions
How long does the Firebase to Supabase migration take?
Most migrations take 2–4 weeks from kickoff to go-live, depending on app complexity. We provide a fixed timeline after the audit phase.
Will I lose any data during the migration?
No. We export a full backup of your Firebase data before touching anything, run a parallel import into Supabase, and reconcile every record. Your original app stays live until you are 100% ready to switch.
Can I keep the same design and brand look?
Yes. We rebuild your UI in Supabase to match your existing design, or use this opportunity to refresh it, your choice. We work from your existing screens or Figma files.
What does the migration cost?
Cost depends on app complexity. Medium effort migrations typically start from €7,000. We provide a fixed-price quote after the free scoping call.
Start your Firebase → Supabase migration
Free 30-minute scoping call. Fixed quote within 48 hours. Your Firebase app stays live until you are ready to switch.
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