Supabase vs Firebase for a New SaaS
Supabase vs Firebase for a new SaaS in 2026: database, auth, realtime, pricing, lock-in and which backend service fits your stack.
Supabase and Firebase solve the same problem — “backend without writing one” — in opposite ways: Postgres-first vs document-based. Here’s which to pick for a new SaaS.
The philosophical difference
- Supabase is an open-source Postgres platform: real SQL, rows/tables, migrations, extensions.
- Firebase is a Google platform built on NoSQL documents (Firestore) with tight mobile/Dart integration.
Feature comparison (verified 2026)
| Feature | Supabase | Firebase |
|---|---|---|
| Database | PostgreSQL 17, full SQL | Firestore (document/NoSQL) |
| JSON flexibility | JSONB | Native documents |
| Auth | Email, OAuth, magic links | Google-native, email, phone |
| Realtime | Realtime Postgres changes | Realtime DB + Firestore streams |
| Storage | S3-compatible buckets | Google Cloud Storage |
| Functions/edge | Edge functions (Deno) | Cloud Functions (Node) |
| Self-host | Yes (Docker) | No |
| Exit strategy | Full SQL dump, any Postgres host | Export JSON, rewrite queries |
| Query power | Joins, indexes, views, RLS | Simple queries + client-side joins |
The SQL factor
If your SaaS has relational data — invoices × line items, teams × members × roles, metered usage — PostgreSQL (Supabase) models it correctly with JOINs and constraints. Firestore forces denormalization and client-side aggregation that grows painful at exactly the wrong time (when you need reporting).
Rule of thumb: if you can sketch your schema with 3+ connected entities, pick Supabase.
Auth comparison
Both handle most auth flows. Supabase Auth is Postgres-backed with Row Level Security — authorization lives in SQL, enforced server-side. Firebase Auth is superb for Google/phone sign-in and has deep mobile SDKs. For a web-first SaaS, Supabase’s RLS approach is cleaner; for mobile-first, Firebase wins on friction.
Realtime
- Supabase: changes flow from Postgres (
realtime.postgres_changes) — the same data powers REST, realtime and dashboard. - Firebase: Firestore streams are native and battle-tested at scale.
Both work; Supabase is more “one source of truth”.
Pricing (verified 2026)
| Supabase | Firebase | |
|---|---|---|
| Free tier | 500 MB DB, 50k MAU auth | 1 GB Firestore, 50k reads/day |
| Entry paid | $25/mo (Pro) | Blaze: pay-as-you-go |
| Scale cost | Predictable per-project | Very Low Usage (VLU) unpredictable bursts |
Firebase Blaze’s pay-as-you-go surprises small teams with bills from reads/bandwidth. Supabase’s flat Pro tier is more predictable for a SaaS.
Our recommendation
Our recommendation: Supabase for a new web-first SaaS
- Full SQL + RLS + migrations = fewer data bugs
- Any Postgres tooling works (pg_dump, psql, pgvector)
- Self-hostable = no lock-in
- Predictable pricing
Firebase if: mobile-first app, heavy Google ecosystem, or the price model and NoSQL fit your data (chat, presence, IoT telemetry).
Migration reality
- Supabase → any Postgres: straight dump/restore.
- Firebase → Firestore is tied to Google; leaving means rewriting queries and auth.
Verdict table
| Need | Choose |
|---|---|
| Relational schema, reporting | Supabase |
| Mobile/app-first, Google login | Firebase |
| AI vector features | Supabase (pgvector) |
| Self-host / exit flexibility | Supabase |
| Battle-tested global scale, huge writes | Firebase |