supabase-vs-firebase.html

Supabase vs Firebase Firestore — which database wins for your brief, in 2026

Two serverless databases, side by side. Supabase is postgres-based platform: database, auth, storage, edge functions, realtime, vectors. open source. Firebase Firestore is google's document database with real-time sync and tight firebase-platform integration. The verdict, the criteria, and the honest take below.

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Verdict in one paragraph

The "Firebase alternative" pitch is real — Supabase wins on relational data, owned-data architecture, and SQL ergonomics. Firebase wins on Google-platform integration and mobile SDK maturity. For greenfield JS / TS web apps, Supabase. For mobile-first apps deeply integrated with Google services, Firebase.

Score across the criteria: Supabase 3 · Firebase Firestore 2 · ties 1

Side by side

Supabase
Firebase Firestore
Category
Postgres
NoSQL / document
Engine
Postgres
JS-native
Pricing
Freemium
Freemium
License
Apache-2.0
Proprietary
Created
2020
2014
GitHub stars
86.4k
closed
Postgres
Yes
No
Edge-ready
No
No

Decision criteria

  • Which is better for relational data?

    Supabase

    Postgres + RLS + foreign keys handle relational data natively. Firestore documents fight against relations.

  • Which is better for document-shaped data?

    Firebase Firestore

    Firestore is document-first by design. Supabase can store JSON in Postgres but the ergonomics differ.

  • Which has the lower vendor lock-in?

    Supabase

    Supabase is open source, Postgres-based, self-hostable. Firebase is fully proprietary and Google-locked.

  • Which has the better mobile SDK?

    Firebase Firestore

    Firebase's mobile SDKs (iOS, Android, Flutter) are mature and battle-tested. Supabase mobile is newer.

  • Which is cheaper at scale?

    Supabase

    Supabase Postgres scales meaningfully cheaper than Firestore at high read volumes.

  • Which has the better realtime story?

    Tie

    Both are excellent. Firestore real-time sync is more mature; Supabase Realtime is newer and Postgres-native.

What Supabase is best for

  • Full-stack apps that need database + auth + storage + functions in one platform
  • Postgres + RLS workloads where row-level security is the primary access control
  • Vector search + RAG apps using pgvector inside the same database
  • Migrating off Firebase to a Postgres-shape data model

Read the full Supabase entry: /serverless-databases/supabase/

What Firebase Firestore is best for

  • Firebase-platform apps using auth + storage + functions
  • Mobile apps where Firestore SDK is the path of least resistance
  • Real-time-first apps (chat, collab, live updates)

Read the full Firebase Firestore entry: /serverless-databases/firebase/

The database choice is the easy half — your migration is the hard one

The hard half is migrating your existing data without losing rows, designing a schema your future-self will not curse, and getting realtime / vector / multi-region right when those matter. The 30-min call is where you describe your stack, your scale, your data shape; I tell you whether Supabase or Firebase Firestore (or something else) is your fit.