Supabase vs Firebase: Postgres vs NoSQL

Supabase vs the alternative at a glance

Supabase is an open-source Firebase alternative built on real Postgres, with auth, storage, and edge functions layered on top — and it's the only one of these two platforms with pricing we can verify. Firebase, Google's mobile and web app platform, competes directly in the same space, but its specific pricing isn't in the fact sheet used to write this page.

Pricing compared

Supabase's free tier includes a 500 MB database on shared CPU with 500 MB RAM, 1 GB of file storage, 5 GB of egress, and 50,000 monthly active users — a generous MAU allowance for most early projects. The catch is that free projects pause after a week of inactivity, which can break demos and low-traffic side projects that don't see regular usage.

Pro is $25/mo and removes that pausing entirely, raising limits to 8 GB disk (then $0.125/GB), 100 GB storage (then $0.0213/GB), 250 GB egress (then $0.09/GB), and 100,000 monthly active users (then $0.00325 per additional MAU). Overages are metered per unit rather than forcing a hard plan upgrade, which keeps the pricing predictable as you scale past the included limits. Team is $599/mo with the same included limits as Pro plus team controls — a steep jump with nothing priced in between.

Firebase's pricing structure isn't included in the fact sheet used for this page, so we can't state a specific number for its free tier, paid tier, or usage-based rates without guessing. If exact Firebase pricing is what you're deciding on, check the vendor's own pricing page directly.

Where Supabase is stronger

The clearest advantage is that Supabase is genuinely standard Postgres, not a proprietary database with a Postgres-like API — you can connect any Postgres client or ORM you already know, and there's no query language to learn from scratch. That removes a real category of lock-in on the data layer that a NoSQL-first platform doesn't offer, since migrating a standard Postgres database elsewhere is a well-understood, well-tooled process.

The free tier's 50,000 monthly active users is far more headroom than most early-stage projects will actually reach, and Pro's $25/mo flat floor with metered overage — rather than a hard cliff — makes cost forecasting more predictable as usage grows. For a deeper look at exactly what the free tier includes and where it runs out, our Supabase pricing explained guide covers that in more depth, and our best backend for a Next.js SaaS roundup covers how Supabase stacks up against other backend options.

Where the alternative is stronger

Firebase is one of the most widely adopted mobile and web backend platforms, with broad SDK support and deep integration into the Google Cloud ecosystem. Without verified pricing in our fact sheet, though, we can't make a specific cost claim for Firebase here — doing so would mean stating a number we haven't checked.

If you're evaluating Firebase directly, pull its current pricing from the vendor's own page rather than trusting a secondhand figure, since usage-based backend pricing in this category can shift with new product tiers. For a wider set of documented alternatives to Firebase, our best Firebase alternatives roundup is a safer starting point than an unverified Firebase number, and our Appwrite vs Supabase comparison covers another open-source option worth weighing.

What we can say honestly is that Firebase's NoSQL data model is a real structural trade-off worth naming even without pricing: a document-based database suits certain access patterns well, particularly mobile-first apps with offline sync needs, while a relational Postgres database like Supabase's suits apps with complex, relational queries better. That's a technical decision independent of price, and it's worth making deliberately rather than defaulting to whichever platform happens to have the more familiar marketing.

Which one should you pick?

Pick Supabase if you want a real Postgres database with no proprietary query layer, a free tier generous enough to reach 50,000 monthly active users, and a predictable $25/mo Pro floor with metered overage instead of a hard cliff. That combination is fully verified here and gives you numbers you can budget from today.

Hold off on picking Firebase based on price alone until you've confirmed its current pricing yourself, since none of its numbers are in the fact sheet backing this page. One real caveat worth flagging regardless of which you choose: Supabase's free tier pauses projects after a week of inactivity, which is a genuine annoyance for demos or side projects with irregular traffic, and the jump from Pro's $25/mo to Team's $599/mo leaves a real gap for a growing team to plan around. Budget for that jump early if you expect to need Team-level controls, since there's no intermediate tier to soften the transition.

Either way, treat this as a starting point rather than a final answer on Firebase specifically. Verify Firebase's current usage-based pricing directly against your expected read, write, and storage volume before assuming any number you've seen elsewhere is still accurate, since usage-based platforms tend to change their metered rates more often than flat-tier competitors do. A side-by-side estimate built from your own expected traffic, not a generic comparison, is the only way to know which platform actually costs less for your specific project.