Supabase vs Firebase vs PlanetScale: Best Backend for Startups
Your database and backend infrastructure choice is one of the hardest to reverse. Firebase's real-time NoSQL feels fast to prototype in but becomes a migration nightmare at scale. Supabase and PlanetScale bring the power of PostgreSQL and MySQL to serverless architectures.
READY TO TAKE ACTION?
Use the free LaunchAdvisor checklist to track every step in this guide.
The Quick Answer
Choose Supabase if you want a full open-source Firebase alternative with PostgreSQL, auth, storage, and real-time — and the ability to self-host or export your data. Choose Firebase if you need real-time sync for mobile apps and are comfortable with Google's ecosystem. Choose PlanetScale if your primary need is a scalable MySQL database with branching workflows.
Side-by-Side Breakdown
Supabase: free tier (2 projects, 500MB), $25/month Pro, PostgreSQL, auth, storage, real-time, edge functions, open-source. Firebase: free Spark plan, pay-as-you-go Blaze, NoSQL Firestore, real-time database, auth, hosting, ML, Google ecosystem. PlanetScale: free hobby tier, $39/month Scaler, MySQL-compatible, schema branching, horizontal sharding, no foreign key support.
When to Choose Supabase
You want a relational database (PostgreSQL) with a clean API and without managing servers. You need auth, storage, and real-time alongside your database in one platform. You value open-source and the ability to self-host or export your data. You are building a web app and want Row Level Security for fine-grained data access control.
When to Choose Firebase
You are building a mobile app (iOS or Android) that needs offline sync and real-time updates. You are deeply in Google Cloud and want integration with other GCP services. You are building a real-time collaborative feature — live document editing, chat, presence indicators — where Firestore's real-time subscriptions are powerful. You accept the NoSQL data modeling tradeoffs.
When to Choose PlanetScale
Your application is MySQL-based and you need a database that scales horizontally without downtime. You want database branching — the ability to test schema changes in a branch before merging, like Git for your database. You are building a high-traffic application and need a database that can handle millions of queries per second.
The Verdict
For most web app startups, Supabase is the best starting point — it gives you PostgreSQL plus the convenience of Firebase's auth and storage without Google lock-in. Firebase remains strong for mobile-first, real-time apps. PlanetScale is for teams with MySQL expertise building at scale. Avoid Firebase's NoSQL if your data has relationships — the query limitations become painful.
How to Get Started
Supabase: sign up at supabase.com, create a project, and your PostgreSQL database is ready in under a minute. Use the table editor to create tables or write SQL directly. Install the Supabase client library and connect your app. Firebase: create a project at firebase.google.com, add the Firebase SDK, and use the Firestore rules editor to secure your data. PlanetScale: sign up at planetscale.com, create a database, create a development branch, and push your schema changes.
RECOMMENDED TOOLS
Some links above are affiliate links. We may earn a commission if you sign up — at no extra cost to you.
FREQUENTLY ASKED QUESTIONS
Is Supabase production-ready?
Yes. Supabase is used in production by thousands of companies. The free tier has limitations (projects pause after 1 week of inactivity), but the $25/month Pro plan provides production-grade uptime SLAs.
Can I migrate from Firebase to Supabase?
Yes, but it requires data transformation — Firestore's document model does not map directly to relational tables. There are community migration scripts, but expect significant engineering work for a production Firebase app.
Does PlanetScale support foreign keys?
PlanetScale does not support foreign key constraints due to its sharding architecture. You can model relationships in your application layer, but if you rely heavily on database-level referential integrity, this is a real limitation to evaluate.