By Quick answer: Should you use Firebase or Supabase?
- Data — Firebase: Firestore (NoSQL); Supabase: Postgres (SQL).
- Mobile tooling — Firebase wins: Crashlytics, Remote Config, messaging.
- Relational data — Supabase wins: joins, constraints, SQL.
- Lock-in — Supabase is open source and self-hostable.
- Pricing — both usage-based with free tiers.
Key takeaways
- Your data shape should drive the choice more than hype.
- Relational, reporting-heavy apps fit Postgres naturally.
- Offline-first mobile apps benefit from Firestore's sync.
- Security rules — Firestore rules or Postgres RLS — must be written and tested.
- Many AI app builders generate Supabase backends by default.
Firebase and Supabase both promise the same thing: skip building a backend and ship your app faster. But underneath, they're built on opposite ideas about data. Firebase's Firestore is a NoSQL document database2; Supabase is built on Postgres1. That one difference shapes almost everything else.
Side by side
| Firebase | Supabase | |
|---|---|---|
| Database | Firestore (NoSQL documents); Data Connect for Postgres3 | Postgres (SQL) |
| Queries | Document queries, limited joins | Full SQL, joins, views |
| Security | Security rules | Row-level security in Postgres4 |
| Auth | Firebase Authentication | Supabase Auth |
| Realtime | Built into Firestore | Realtime on Postgres changes |
| Functions | Cloud Functions | Edge Functions |
| Offline sync | Strong, built into SDKs | Requires extra work |
| Mobile extras | Crashlytics, Remote Config, Cloud Messaging, App Check | Fewer mobile-specific services |
| Open source | No | Yes, self-hostable |
| Pricing | Usage-based, free tier | Usage-based, free tier |
Choose Supabase if…
- Your data is relational: users, orders, products, permissions
- You want SQL for reporting and analytics
- Avoiding vendor lock-in matters
- You're using an AI app builder that generates a Supabase backend
Choose Firebase if…
- You're building a mobile-first app that must work offline
- You want crash reporting, remote config and push in one console
- Your data is naturally document-shaped
- You're already on Google Cloud
Key terms, defined
Backend as a service (BaaS) — hosted backend features like database and auth. NoSQL — databases storing documents instead of tables. Postgres — a popular open-source relational database. Row-level security — rules controlling which rows users can access. Vendor lock-in — dependence that makes switching hard.
Frequently asked questions
Is Supabase better than Firebase?
Neither is better overall. Supabase suits relational data and SQL; Firebase suits mobile apps needing offline sync and Google's mobile services.
Is Supabase a Firebase alternative?
Yes. Supabase positions itself as an open-source alternative, offering a Postgres database, auth, storage, edge functions and realtime.
Does Firebase support SQL?
Firebase Data Connect brings PostgreSQL (via Cloud SQL) to Firebase, but Firestore — its flagship database — is NoSQL.
Which is cheaper?
Both have free tiers and usage-based pricing. Costs depend on reads, writes, storage and bandwidth. Model your expected usage on each pricing page.
Can I self-host Supabase?
Yes. Supabase is open source and can be self-hosted, which reduces lock-in.
Which is more secure?
Both can be secure. Firebase uses security rules; Supabase uses Postgres row-level security. Misconfigured rules are the most common cause of data leaks in both.
Sources
- Supabase — Documentation
- Firebase — Cloud Firestore
- Firebase — Data Connect
- Supabase — Row level security
- Checked October 23, 2026. Figures that change — fees, salaries, prices — are reviewed every six months; if something is out of date, tell us.
Where to go from here
- Best backend for mobile apps — wider options
- SQL vs NoSQL — the underlying choice
- Tech stackThe best backend for mobile apps: BaaS, serverless or custom — how to choose for your appThe best backend for mobile apps: Firebase, Supabase, serverless and custom APIs compared by speed, cost, control and scale — with a decision guide.
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