We have built production apps on both Supabase and Firebase. Firebase dominated the BaaS space for years, and for good reason, it is fast to prototype with and Google's infrastructure is rock solid. But Supabase has changed the game by offering a Postgres based alternative that gives you real database power without sacrificing developer experience. Here is what actually matters when choosing between them.
| Feature | Supabase | Firebase |
|---|---|---|
| Database | Full Postgres database, relational data, joins, constraints, indexes, views, and stored procedures. Your data stays structured and queryable as complexity grows | NoSQL document store (Firestore) or legacy real time JSON tree. Great for simple data but becomes painful when you need relational queries, aggregations, or complex filtering |
| Auth | Built in auth with email, OAuth, phone, and magic links. Row Level Security policies live in the database, so auth and data access are tightly coupled | Firebase Auth is mature and supports every provider. Identity Platform adds enterprise features. Solid but decoupled from data access rules |
| Real Time | Postgres based real time subscriptions via database changes. Works well for most use cases but has higher latency than Firebase's WebSocket approach | Firebase Realtime Database and Firestore both offer sub 100ms real time sync. If real time is your primary use case, Firebase is genuinely better here |
| Pricing | Predictable pricing based on database size and API requests. Free tier is generous. No surprise bills because there are no per document read charges | Pay per read/write pricing can spike unexpectedly. A single badly written query can cost hundreds. Free tier is good but production costs are hard to predict |
| Vendor Lock In | Standard Postgres, you can migrate to any Postgres host (AWS RDS, Railway, self hosted) with pg_dump. Your SQL knowledge transfers everywhere | Deeply locked into Google Cloud. Firestore's proprietary data model means migration requires rewriting your entire data layer. Firebase specific SDKs everywhere |
| Edge Functions | Deno based Edge Functions deployed globally. TypeScript first, access to the full Deno ecosystem. Cold starts are fast but the ecosystem is younger | Cloud Functions (Node.js) have a large ecosystem and extensive documentation. Cold starts can be slow on free tier and pricing scales steeply with usage |
| Storage | S3 compatible object storage with RLS policies. Direct uploads, image transformations, and CDN delivery included | Firebase Storage (backed by Google Cloud Storage) is reliable and well integrated. Security rules are straightforward. Image processing requires Cloud Functions |
| Developer Experience | SQL first approach with a clean dashboard, table editor, and SQL editor built in. Local development with CLI and branching. TypeScript types auto generated from schema | Excellent SDKs and documentation. Firebase console is polished. Firebase Emulator Suite for local development is solid. Years of community content and tutorials |
| Scaling | Postgres scales vertically with larger instances and horizontally with read replicas. Connection pooling handles thousands of concurrent users. Predictable performance characteristics | Firestore scales horizontally with zero configuration, this is a genuine strength. For read heavy workloads with simple queries, Firebase scaling is effortless |
Why Supabase
- +Full Postgres gives you relational data modeling, joins, aggregations, and decades of SQL ecosystem tooling
- +Zero vendor lock in, standard Postgres means you can migrate anywhere with pg_dump
- +Predictable pricing with no per read charges that can spike your bill unexpectedly
- +Row Level Security in the database means your auth and data access rules are co located and version controlled
- +Auto generated TypeScript types from your database schema eliminate a whole class of bugs
Why Firebase
- +Firebase's real time sync has a head start for sub 100ms use cases
- +Firestore's automatic horizontal scaling requires zero configuration, it just works
- +Firebase Auth is one of the most mature and feature complete auth solutions available
- +Massive ecosystem with years of tutorials, Stack Overflow answers, and community packages
The Verdict
Our Honest Take
If your app is data heavy, needs complex queries, or you want to avoid vendor lock in, use Supabase. Postgres gives you power that NoSQL cannot match, and you will never get a surprise bill from document reads. If you are building something where real time sync is the core feature (like a chat app or collaborative editor) and you want the most battle tested solution, Firebase is still a strong choice. We build on Supabase because most apps we work on need relational data, predictable costs, and the ability to migrate if needed.
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