Migrate from Firebase to Supabase

Why Migrate

• Open-Source Freedom: Supabase is fully open-source. You can self-host, inspect the codebase, and avoid vendor lock-in that Firebase imposes.
• PostgreSQL Power: Replace Firestore's limited query model with full SQL, JOINs, CTEs, and window functions on a real PostgreSQL database.
• Predictable Pricing: Firebase costs spike unpredictably with reads/writes. Supabase pricing is based on storage and compute, making costs transparent and forecastable.

Migration Roadmap

1. Firebase Audit & Planning (1–2 weeks): Inventory Firestore collections, Firebase Auth users, Cloud Functions, Storage buckets, and security rules. Design the Supabase schema.
   • Firebase service inventory
   • Supabase PostgreSQL schema
   • Auth migration plan
   • Security rule to RLS mapping
2. Data & Auth Migration (2–4 weeks): Migrate Firestore documents to PostgreSQL tables, transfer Firebase Auth users to Supabase Auth, and move Storage files to Supabase Storage.
   • Migrated PostgreSQL data
   • User accounts with preserved UIDs
   • Storage bucket migration
   • RLS policies
3. Application Refactoring & Cutover (2–4 weeks): Replace Firebase SDK calls with Supabase client, convert Cloud Functions to Supabase Edge Functions, and execute cutover.
   • Refactored application code
   • Edge Functions deployment
   • End-to-end test suite
   • Production cutover

Risks & Mitigation

• Firebase Auth user passwords cannot be exported: We import Firebase Auth users into Supabase Auth using password hashes where available, and trigger password reset flows for users whose hashes cannot be transferred.
• Firestore real-time listeners have no direct Supabase equivalent: Supabase Realtime uses PostgreSQL's LISTEN/NOTIFY under the hood. We map Firestore onSnapshot listeners to Supabase Realtime subscriptions with equivalent functionality.

Estimated Scope

Hours: 140–280 | Cost: $280–$560 | Timeline: 5–10 weeks

Frequently Asked Questions

Can Supabase handle real-time updates like Firestore?

Yes. Supabase Realtime provides row-level change subscriptions using PostgreSQL logical replication. It covers insert, update, and delete events with filtering.

Will my Firebase Auth users need to reset passwords?

In most cases, no. We transfer password hashes when Firebase exports allow it. For edge cases, we implement a seamless re-authentication flow on first login.

How does Supabase pricing compare to Firebase?

Supabase charges by database size and compute, not per-operation. Most teams see 40-70% cost reduction, especially at scale where Firebase read/write charges compound.