◢Supabase vs Firebase, decided in five minutes
We have shipped on both. Supabase vs Firebase is not a fight we settle with a feature spreadsheet, because we have paid real money to each and wired them into real products. The first question we ask is dead simple: do you want a SQL database you own, or a NoSQL service Google runs for you?
Firebase is the safe mobile default. Google has poured a decade into it, and its real-time sync still feels like magic for chat and collaborative apps. Supabase is the open-source challenger built on Postgres, and it crossed 100,000 GitHub stars in 2026 on its way to a $5B valuation (Supabase).
That split, a relational database you can self-host versus a polished proprietary one you cannot, decides more than any feature list. Here is how we actually choose, what each costs in 2026, and the line items we would cut.
◢What is the real difference between Supabase and Firebase?
Supabase is an open-source backend built on a Postgres relational database. Firebase is a proprietary Google platform built on Firestore, a NoSQL document database. Both hand you auth, storage, functions, and APIs without managing servers. The gap is the data model and who owns it.
Firebase stores your data as JSON-like documents in collections. There is no fixed schema, so two records in the same place can have totally different fields. That flexibility is great when you are still guessing at your data model, and painful once your app has real relationships.
Supabase stores rows in tables with schemas, foreign keys, and constraints (Supabase docs). You query with SQL, get real joins, and the database enforces your rules. It is more structure up front in exchange for fewer surprises later. If you have ever fought Firestore to fake a join, you already feel this difference.
◢How much do Supabase and Firebase cost in 2026?
Both are free to start. Firebase bills per database operation, which is unpredictable. Supabase bills for compute and storage, which you can forecast. At scale Supabase usually wins on both price and sanity.
Here is the head-to-head on the plans most founders care about.
| Firebase | Supabase | |
|---|---|---|
| Database type | NoSQL document (Firestore) | Relational SQL (Postgres) |
| Free tier | Spark: 50K reads, 20K writes, 20K deletes per day; 1 GiB stored (Firebase) | Free: 500 MB database, 50K monthly active users, unlimited API requests (Supabase) |
| Paid entry | Blaze: pay-as-you-go, $0.18 per 100K reads, $0.18 per 100K writes (Google Cloud) | Pro: $25 per month per project, then usage-based (Supabase) |
| Pricing model | Per operation (read/write/delete) | Per compute and storage |
| Team / compliance tier | Custom enterprise | Team: $599 per month with SOC 2 and ISO 27001 (Supabase) |
| Self-hosting | Not supported | Fully self-hostable via Docker |
| Best for | Mobile apps, real-time sync, Google stack | Relational data, SQL teams, data ownership |
The catch with Firebase is the operation-based billing. Firestore charges per document read, write, and delete (Google Cloud). That sounds fine until one unoptimized query reads 10,000 documents to show 10 results, or a viral moment quietly triples your invoice. We have watched a friend's side project bill spike from a single bad loop.
Supabase's bill maps to data volume and compute, not access patterns. The trade-off: on the free plan, Supabase pauses projects after one week of inactivity (Supabase docs), so a sleepy side project needs a paid plan to stay warm. Want to model this against your whole toolset? Run it through our stack cost calculator.
◢Which one wins on real-time and mobile?
Firebase, for now. Its real-time sync was built from day one and is still the smoother experience, especially on mobile where offline caching just works (Firebase docs). Supabase's real-time is solid but was added on top of Postgres later.
Firebase attaches a listener and updates flow automatically. The SDK handles reconnection, offline reads and writes, and conflict resolution. For chat, multiplayer, and live collaboration, that is table stakes, and Firebase nails it. Its iOS, Android, and Flutter SDKs have a decade of polish behind them.
Supabase does real-time through Postgres change feeds, and for most apps it is more than enough. But if real-time IS your product, not a feature, Firebase still has the edge. We tell mobile-first founders to prototype the live piece on Firebase before committing either way.
◢How do authentication and security compare?
Both ship strong auth with email, OAuth, magic links, and phone login. The difference is where your access rules live. Firebase uses a separate Security Rules language. Supabase pushes authorization into the database itself with Postgres Row-Level Security.
Firebase Authentication is easy for email and social logins. Enterprise features like SAML and OIDC require upgrading to the Identity Platform, which adds new usage limits (Firebase docs). It is mature and battle-tested, with more OAuth providers out of the box.
Supabase ties auth to Postgres, so you write access policies in SQL with Row-Level Security (Supabase docs). A rule like "users can only see their own rows" lives in the database and is enforced everywhere automatically. Some developers love this. Others find it awkward. It is genuinely powerful when it matches how you think.
◢What about vendor lock-in and self-hosting?
This is where the two part ways hardest. Supabase is open-source and runs on standard Postgres, so you can self-host or move clouds anytime. Firebase is proprietary, and Firestore has no open-source equivalent, so leaving means rewriting your data layer.
Supabase's core is open-source on GitHub, with more than 1,700 contributors (GitHub). Postgres runs on AWS, Google Cloud, Azure, DigitalOcean, or your own box. Your data, your schema, your auth users: all portable. If you outgrow the managed plan, you fire up Docker and keep going.
Firebase is a one-way door. You can export auth users, but the database itself is Google-only. For a weekend project, lock-in barely matters. For a business betting its roadmap on one vendor's pricing, it is a real risk. This is the same build-versus-rent tension we cover in build vs buy for startup tools, and it is why open-source keeps winning founder trust.
◢What we would cut
Here is the cheeky part, and nobody pays us to say it. Most founders over-buy backend. You do not need the $599 Supabase Team plan or a Blaze-fueled Firebase sprawl on day one. You need one database, auth, and a free tier until you have users.
Cut the second backend. We see teams run Firebase for auth, a separate database for app data, and yet another tool for files. Pick one platform that does all three and delete the rest. That is the whole point of consolidating, the same logic behind our SaaS sprawl audit.
Cut the premature scaling, too. Both free tiers carry a real product surprisingly far. If you are non-technical, you can wire most of this with no code first, which we walk through in no-code for non-technical founders. Spend the savings on getting customers, not on compute you are not using yet. For more ways to trim the bill, see how we cut SaaS costs.
◢The verdict: pick Supabase if, pick Firebase if
We are not neutral, but we are independent. Here is the clean call.
Pick Supabase if you want a relational database, predictable pricing, SQL joins, and an open-source escape hatch you can self-host. It is the better default for web apps, dashboards, AI products, and any team that already thinks in tables. Most founders we coach land here.
Pick Firebase if mobile is your core surface, real-time sync is the product, and you want Google's mature SDKs doing the heavy lifting. If your app is a chat tool, a multiplayer game, or anything live-first on iOS and Android, Firebase still earns its keep.
If you are torn, default to Supabase. The portability and predictable bill protect you from the two things that bite founders later: surprise invoices and lock-in. You can always layer Firebase in for a specific mobile feature without betting the whole stack on it. Want the same honest treatment for the rest of your toolkit? We pressure-test individual tools in our breakdowns of Airtable alternatives and Retool alternatives.
Bottom line: Supabase vs Firebase is really SQL you own versus NoSQL you rent. Start with the data model, respect the lock-in, and keep the bill predictable. If you want more no-nonsense calls like this one, subscribe to our newsletter. Nobody pays us to recommend anything, and we keep it that way.
◢FAQ
What is the main difference between Supabase and Firebase? Supabase is an open-source backend built on PostgreSQL, a relational SQL database you can self-host. Firebase is a proprietary Google platform built on Firestore, a NoSQL document database you cannot self-host. Supabase gives you SQL, joins, and portable data. Firebase gives you mature mobile SDKs and best-in-class real-time sync. The data model is the decision that drives everything else.
Is Supabase cheaper than Firebase? Usually, and more predictably. Firebase bills per document read, write, and delete, so a bad query or a viral spike can blow up your bill. Supabase bills for compute and storage, which you can estimate up front. At scale Supabase tends to cost less, but both have generous free tiers. Run your real usage through the numbers before you commit.
Can you self-host Supabase or Firebase? You can self-host Supabase. Its core is open-source, so you can run the whole stack with Docker on your own server and pay zero per-seat fees. You cannot self-host Firebase. Firestore is a Google-only database with no open-source equivalent, so leaving Firebase means rewriting your data layer. That portability gap is the biggest reason teams pick Supabase.
Is Firebase still better for mobile apps? For now, often yes. Firebase has a decade-long head start on mobile, with mature iOS, Android, and Flutter SDKs plus offline caching that just works out of the box. Supabase has client libraries and offline tooling like Electric and Zero, but Firebase's mobile real-time sync is still the smoother experience. If mobile is your core surface, test Firebase first.
Should I switch from Firebase to Supabase? Switch if Firestore's pricing surprises you, you keep fighting the lack of joins, or vendor lock-in worries you. Do not switch a working product just because Supabase is trendy. Migration means moving your data model from documents to tables and rewriting queries. New project, leaning relational? Start on Supabase. Stable Firebase app shipping fine? Leave it alone.