Supabase Won Because Firebase Lost Control
Most people think Firebase and Supabase compete in the same category. Wrong.
Firebase is a BaaS that hides your database behind proprietary APIs. Supabase is PostgreSQL on steroids: a real SQL database you scale however you want. The difference isn't small. It's fundamental.
Five years ago, choosing Firebase made sense: it was fast, serverless, frictionless. Today in 2026, many teams hit limits Firebase was never designed to solve. The real problem with Firebase isn't price. It's dependency.
Once your app grows, you're locked in. Migrating out of Firebase is like removing a tattoo: slow, expensive, never looks the same. Supabase gives you the exit door from day one: it's pure PostgreSQL.
1. The Reality of Pricing: It's Not What You Think
Firebase sells you "pay-as-you-go". In theory, beautiful. In practice, nightmare.
Every operation costs. Reads, writes, storage, bandwidth. A real-time chat with 1,000 active users can cost 750-1,400 € per month on Firebase without you seeing it coming. One of my clients in Barcelona scaled from 180 € monthly to 3,900 € in three months because their read rate grew 3x. No code changed.
Supabase uses the PostgreSQL model: you pay for resources, not operations.
Real comparison at medium scale (10,000 active users):
❌ Firebase: Realtime database + Cloud Functions + Storage → 2,300-3,800 € per month (variable, unpredictable)
✅ Supabase: 2GB storage + 2vCPU + 4GB RAM → 300 € per month (fixed, scalable)
The difference: in Supabase you know exactly what you pay. In Firebase, your bill is a black box.
This is the biggest shift since 2024. Teams that switched from Firebase to Supabase reduced costs by 60-75% without losing features. Some even like Vercel built their own alternative because Firebase bled them too dry.
2. Real Control Over Your Data: Non-Negotiable
In Firebase, your data lives on Google's servers. Period.
That means: Google can study it, Google can drop support tomorrow, Google can change pricing next week. You have no control. Only access.
In Supabase, your data is yours. PostgreSQL is open-source. You can backup whenever you want, export in minutes, migrate to AWS, Hetzner, or your own server without touching a line of code.
For Spanish startups and agencies, this is critical. If your client has regulations (GDPR, regulated sectors), Supabase lets you comply. Firebase? Makes it hard.
Concrete:
→ You export Supabase data in 2 minutes with a psql command
→ You export Firebase data and need to parse JSON, transform it, and wait for it to finish
→ With Supabase, you can host your own PostgreSQL instance if Google wants more money
→ With Firebase, you're trapped
3. SQL vs NoSQL: Supabase Won This Debate
Firebase uses Realtime Database (NoSQL) and Firestore (semi-SQL). Both are nested structures that work for quick prototypes but explode in complexity as your product matures.
Supabase uses PostgreSQL, the most reliable SQL engine in the world. Defined relationships, constraints, triggers, stored functions.
For a chat: both work.
For a marketplace with orders, users, payments, inventory, reviews: SQL wins 10-0. Complex queries in Firestore require multiple reads and post-processing in JavaScript. In Supabase, a single SQL query does the same in 10ms.
Example: get user orders with product details and reviews
In Firestore, you need:
- Fetch all user orders
- Loop over each order
- Fetch items for each order
- Fetch products
- Fetch reviews
- Merge in JavaScript
Result: 1 SQL query (10ms) vs 20+ Firestore reads (500-800ms)
This isn't opinion. It's math.
4. Realtime: Supabase Closed the Gap
Firebase had an advantage in Realtime Database. It was its strength.
In 2024, Supabase released Realtime completely redesigned. Today it's at parity. Latency is identical, performance is identical, reliability is identical.
But Supabase did it better: you use native PostgreSQL with triggers and functions. Not a proprietary hidden database.
It's clean, powerful, and works because PostgreSQL supports it natively. It's not a hack. It's architecture.
5. Ecosystem of Tools: Supabase is More Modern
Firebase has: Firestore, Realtime DB, Auth, Storage, Functions.
Supabase has: PostgreSQL, Auth (with OAuth, SSO, Magic Links), Storage (S3-compatible), Edge Functions (with Deno), Vector embeddings for AI, Cron jobs, and native webhooks.
The key difference: Supabase has modern integrations that Firebase never had.
Vectors for embeddings (fundamental for RAG in 2026). Edge Functions with Deno. Cron jobs without serverless overhead. Webhooks for almost any event.
For teams building with AI in 2026, Supabase wins. Firebase requires workarounds.
6. Migration Cost: Lower Than You Think
Many people say "migrating from Firebase is impossible". False.
It's work, but it's not impossible.
Real timeline for a medium app (10,000 users):
→ Day 1: Export Firebase data to JSON
→ Day 2: Transform JSON schema to PostgreSQL
→ Day 3: Migrate JavaScript queries to SQL (most can be automated)
→ Day 4-5: Test and refactor Edge Functions
→ Day 6: Deploy in parallel, setup data replication
→ Day 7: Cutover (database switch)
Total time: 1-2 weeks for medium applications.
Cost of that migration: 5,500-11,000 € in development. You recover that investment in 3-4 months of hosting savings.
A team of three Spanish developers can do this migration themselves. I've seen startups do it solo.
7. Where Firebase Still Wins
Let's be fair. Firebase has use cases where it's superior.
Use Firebase if:
→ You need a prototype in 48 hours and it won't scale (real hackathons, real MVPs)
→ Your product is 100% mobile with no complex backend
→ You want zero DevOps (Firebase handles everything)
→ Your team doesn't know SQL
Use Supabase if:
→ You need a relational database
→ Your application scales fast
→ You need control over your data
→ You want predictable pricing
→ You integrate AI/Vectors/complex functions
8. Real Use Case: Spanish Marketplace
A client in Madrid built a marketplace for craftspeople. Started on Firebase.
At 6 months, with 500 sellers and 5,000 monthly orders, the Firebase bill was 1,950 € per month. Complex queries (seller reports, inventory analysis) took 3-5 seconds.
They migrated to Supabase.
Results:
→ Cost: dropped to 250 € per month (87% reduction)
→ Performance: queries dropped from 4 seconds to 150ms
→ Complexity: they could add features like vector-based recommendations without rethinking architecture
→ Timeline: 10 days of migration
Today this client makes 42,000 € annually in commissions. Supabase costs 3,000 € annually. Firebase would have cost 23,400 €. Difference: 20,400 € annual profit.
That's what matters.
The Decision: It's Not Complex
Supabase vs Firebase in 2026 isn't a technical debate. It's financial analysis.
Firebase: Fast for MVPs, expensive at scale, controlled by Google.
Supabase: Slightly more setup, predictable cost, yours from day one.
If your app will grow beyond 1,000 users or 450 € monthly hosting, Supabase is the right bet. It's PostgreSQL. It's been reliable for 25 years. It will stay that way.
The future isn't choosing between Firebase and Supabase. It's understanding that Firebase is for fast prototyping, Supabase is for businesses that want to exist in 5 years.
Start with Supabase today. The SQL learning curve is two weeks. Cost savings appear in month 1 when you scale.
