Supabase vs Firebase
The backend your builder chose shapes everything after it: how you query data, how you keep one customer out of another's records, and how hard it is to leave. Here is the honest split.
Supabase
Postgres with a REST and realtime layer on top. Relational data, SQL, and row-level security.
What it leaves for productionFirebase
Google's app platform: a NoSQL document store, realtime by default, tightly integrated with mobile.
Where they differ
| Supabase | Firebase | |
|---|---|---|
| Data model | Relational tables and SQL. Joins, constraints and migrations are first-class. | Documents and collections. Flexible early, harder to keep consistent as it grows. |
| Access control | Row-level security policies in the database, enforced for every query. | Security rules evaluated per request, written in Firebase's own rules language. |
| Querying | Full SQL, so complex reporting stays in the database. | Limited queries by design; aggregation and joins move into your code. |
| Lock-in | Low. It is Postgres, so you can take the database anywhere. | Higher. The data model and rules are specific to Firebase. |
| Where it breaks first | Row-level security never enabled, so the public key reads every table. | Rules left in test mode, so any client can read or write the whole database. |
Which to choose
Choose Supabase
Pick Supabase if your data is relational, you want SQL and reporting, and you care about being able to move the database later.
Choose Firebase
Pick Firebase if you are realtime-first, mobile-heavy, and happy inside Google's ecosystem for the speed it buys.
What both leave for production
Both are safe when configured and dangerous when not, and the failure is the same shape: access rules left open. The single most common critical finding in our audits is a database that answers the public key with real data. We enable and prove the rules, table by table, whichever backend you are on.
Common questions
It depends on shape, not headline price. Firebase bills per read, write and delete, which is cheap at low volume and surprising when a screen fans out into thousands of document reads. Supabase bills more like a database and a server, which is more predictable under steady load. We model both against your actual usage.
Usually no. The work that makes an app safe to launch is enabling and testing the access rules on the backend you already have. A migration only makes sense when you are hitting a real limit of the data model or the cost curve, and that is a separate decision from launching safely.
Whichever you picked, we make it production-ready
Start with the free scan, or book the free Production Check.