SupabasevsFirebase
TL;DR
Supabase wins if you want SQL, RLS, and an open stack. Firebase wins if you want Google's first-class mobile SDKs and you don't mind document-only data. For new web SaaS in 2026, Supabase is the calmer choice.
Web SaaS with relational data
Supabase
Mobile-first with Google Play / iOS focus
Firebase
Open-source / portable
Supabase
| Feature | Supabase | Firebase |
|---|---|---|
| Database | Postgres | Firestore (NoSQL document) |
| Auth | GoTrue + JWT | Firebase Auth + custom claims |
| Storage | Self-hosted S3-compatible | Google Cloud Storage |
| Realtime | Postgres LISTEN/NOTIFY + replication | Firestore listeners |
| Pricing model | Per-project compute + storage | Per-read/write + bandwidth |
| Self-hosting | Yes (open-source) | No |
| Vendor lock-in | Low (it's Postgres) | High |
| Schema / types | Enforced, introspectable | Schema-less, sampled |
| RLS-style authorization | Native Postgres RLS | Firestore Security Rules |
When Supabase wins
- You have relational data (users, orgs, projects, posts). RLS gives you fine-grained authorization without writing rules in a separate language.
- You want SQL. Joins, window functions, CTEs, aggregates - all first-class.
- You don't want to be locked in. Postgres is portable; you can always leave for self-hosted or another provider.
- You want predictable pricing. Per-project compute scales smoothly; you don't get a surprise bill from a runaway listener.
- You're vibe-coding with AI. Schema introspection means agents don't hallucinate column names.
When Firebase wins
- You're mobile-first and tightly integrated with Google's ecosystem. Firebase SDKs for iOS and Android are mature and well- documented.
- Your data really is document-shaped. Polymorphic events, deeply nested user-generated content, etc.
- You want the bundled extras (Crashlytics, Analytics, FCM) in one place.
- You're a solo founder shipping a consumer app and don't want to think about a database at all for the first six months.
Honest take
For a new web SaaS project in 2026, Supabase is the default and Firebase is a specific tool for a specific shape (mobile apps with consumer-grade scale and document data). Firebase's lock-in is real; the migration story to leave is painful; the Security Rules language requires its own debugging muscle. None of that is fatal, but it's tax you pay on a daily basis.
Supabase is open-source. You can self-host. You can move. The Postgres you're using inside Supabase is the same Postgres used by every other serious data platform in the world. That portability quietly compounds into "the right default".