Supabase vs Firebase Comparison
Supabase (open-source Postgres) vs Firebase (Google's BaaS). We compare realtime capabilities, pricing, vendor lock-in, and help you choose the right backend platform.
Supabase
The open source Firebase alternative.
Primary Task
Backend DB
Pricing
FreemiumKey Features
- Postgres Database
- Realtime Subscriptions
- Auth & Storage
Firebase
App development platform backed by Google.
Primary Task
Backend as a Service
Pricing
FreemiumKey Features
- Realtime Database
- Auth
- Hosting
At a Glance
| Feature | Supabase | Firebase |
|---|---|---|
| Database | PostgreSQL (SQL) | Firestore (NoSQL) |
| Realtime | Postgres Changes (CDC) | Native (Document listeners) |
| Authentication | Built-in (GoTrue) | Firebase Auth |
| Storage | S3-compatible | Cloud Storage |
| Edge Functions | Yes (Deno) | Cloud Functions |
| Open Source | ||
| Self-Hostable | ||
| Offline Support | Limited | Native (Mobile SDKs) |
Pros & Cons
Supabase
Strengths
- Open source & self-hostable (no vendor lock-in)
- Full SQL power (JOINs, complex queries)
- Predictable pricing
- Postgres ecosystem (pgvector, PostGIS, etc.)
- Row Level Security for multi-tenancy
Limitations
- Newer platform (less mature than Firebase)
- Realtime requires setup (not automatic)
- Smaller community than Firebase
- Cold starts on free tier
Firebase
Strengths
- Mature platform (since 2011)
- Best-in-class mobile SDKs
- Automatic realtime sync
- Offline support built-in
- Google Cloud integration
- Crashlytics & Analytics included
Limitations
- Proprietary (vendor lock-in to Google)
- Complex pricing (read/write costs)
- NoSQL limitations (no JOINs)
- Not self-hostable
- Cost can spike unexpectedly
The Verdict
Choose Supabase
Best for
- you need SQL power, want to avoid vendor lock-in, or require predictable pricing. It's the best choice for developers who value open source and need complex relational queries.
Choose Firebase
Best for
- you're building a mobile app that needs offline-first capabilities, or if you want the most mature BaaS with the best mobile SDKs. It's ideal when you're already in the Google Cloud ecosystem.
Frequently Asked Questions
Can I migrate from Firebase to Supabase?
Yes, but it requires work. You'll need to export Firestore data (NoSQL) and restructure it for Postgres (SQL). Supabase doesn't have automated migration tools, so expect a manual migration process.
Is Supabase really free like Firebase?
Yes. Supabase's free tier includes 500MB database and 1GB bandwidth. Firebase's free tier includes 1GB storage. Both are generous for small projects, but Supabase's pricing is more predictable as you scale.
Which has better realtime capabilities?
Firebase has more mature realtime with automatic syncing and offline support. Supabase's realtime uses Postgres CDC (Change Data Capture) which is powerful but requires more configuration. For mobile offline-first apps, Firebase wins. For web apps with SQL needs, Supabase is better.
Can I use Supabase with React Native?
Yes! Supabase has official React Native support. However, Firebase's mobile SDKs are more mature with better offline support and platform integrations.
Is Firebase more expensive than Supabase?
It depends. For read-heavy apps, Firebase can get expensive (charged per document read). Supabase pricing is based on database size and bandwidth, which is more predictable. At scale, Supabase is often cheaper, but Firebase's free tier is more generous initially.