Supabase vs Firebase for an MVP Backend
By CodexierPublished 5 min read
Supabase and Firebase solve the same problem for a founder: a database, authentication, file storage and realtime updates, ready to use without running servers. They look similar in a feature table, but they are built on different ideas about data, and that difference shapes your product for years. This guide compares them on what matters for a Swedish MVP. For transparency: we build on Supabase ourselves, so weigh our view with that in mind.
Relational vs document data
Supabase gives you a PostgreSQL database: tables, columns, relations, joins and SQL. Firebase's main database, Firestore, stores documents in collections, similar to JSON files grouped in folders. A document model is quick to start with and scales reads well, but questions that span several collections, such as all unpaid invoices for customers in one region, need extra work: duplicated data, extra queries or a separate search service. A relational model answers them with one query. Firebase now also offers a Postgres option through Data Connect, which narrows the gap but adds another service to learn.
Authentication and security rules
Both include login with email, magic links and social providers, and both can be extended with BankID through a third-party identity provider. The larger difference is how access is enforced. In Supabase, row level security policies in the database decide which rows each user can read or change. In Firebase, security rules written in a separate language protect each collection. Both work well when written carefully and both are dangerous when left open, which is the most common serious mistake in MVPs on either platform.
| Topic | Supabase | Firebase |
|---|---|---|
| Access control | Row level security in PostgreSQL | Security rules per collection |
| Testing access | SQL tests against policies | Rules emulator and unit tests |
| Multi-tenant B2B | Natural with organisation ids and policies | Possible, needs careful rule design |
| Server logic | Edge functions and database functions | Cloud Functions |
EU hosting and GDPR
Supabase lets you choose a region per project, including EU regions, and the whole project, database, storage and auth, lives there. Firebase lets you choose a location for Firestore and Storage, but some services have historically processed data outside the EU, so read the data location documentation for each service you enable. With either provider, sign the data processing agreement, record the subprocessors in your own documentation and choose the region at creation, because moving a project later is a migration. Our GDPR guide for SaaS founders covers what your B2B customers will ask.
Pricing as you grow
The pricing shapes differ. Supabase charges mainly per project for database size, compute and bandwidth, which makes costs predictable and tied to how big your database is. Firebase charges per document read, write and delete, plus storage and bandwidth, which is cheap for small apps and can surprise you when a screen reads many documents or a bug loops. In both cases, set spending alerts from day one and look at the pricing pages yourself, since both change their plans.
- Estimate your busiest screen: how many records does it load per visit?
- Multiply by daily active users and visits per day for a rough monthly volume.
- Check how each provider bills that pattern, then add storage and bandwidth.
- Set budget alerts, and never deploy a loop that reads the database on every render.
Lock-in and exit options
Supabase is open source and built on PostgreSQL, so you can export the database with standard tools and run it elsewhere, or self-host Supabase itself. Your authentication and storage need migrating, but the core data moves as is. Firestore has no equivalent elsewhere; leaving means exporting documents, redesigning them as tables or another document store and rewriting every query. That is not a reason to avoid Firebase, but it should be a conscious choice.
When you do not need either: an internal tool for a few people may fit a no-code platform, and a product with strict data residency or complex compliance may need a standard cloud database run by your own team. If you are unsure, our MVP planning blueprint settles the stack, data model and access rules before any code is written. Compare options in choosing a SaaS tech stack, see the pricing page, or book a call.
Frequently asked questions
Is Supabase mature enough for a production product?
Yes, for most SaaS products. Underneath it is PostgreSQL, which has decades of production use. Treat it like any managed database: pick a paid plan for production, enable backups and point-in-time recovery if your data needs it, and monitor usage.
Can we switch from Firebase to Supabase later?
Yes, but it is a real project. Documents must be redesigned as tables, security rules rewritten as policies and users migrated. The earlier you switch, the cheaper it is; after launch, plan it as a migration with a test period.
Which is better for a mobile app?
Firebase has deeper native mobile tooling, such as crash reporting and push notifications in the same console. Supabase works well from mobile apps too, and many teams pair it with a separate push service. Decide on the data model first.
Do we still need our own backend code?
Usually some. Both handle standard create, read, update and delete operations, but payments, integrations with Fortnox or other systems and scheduled jobs belong in server-side functions, not in the app.
Choose the backend before you build on it
Book a short call and describe your product's main data and users. We tell you which backend fits and what to decide about data model and access rules first.
Book a free 15-minute call