Supabase vs PlanetScale — PostgreSQL vs MySQL, But Really It's About Your Stack

Supabase gives you a full backend in a box; PlanetScale gives you a bulletproof MySQL database. Pick based on whether you want batteries included or just the engine.

This Isn't Just PostgreSQL vs MySQL

Most comparisons frame this as a database engine debate, but that's missing the point. Supabase is a backend-as-a-service built on PostgreSQL, offering auth, realtime subscriptions, and storage out of the box. PlanetScale is a serverless MySQL platform with branching and zero-downtime schema changes. They're in different weight classes: Supabase is for devs who want a full backend fast; PlanetScale is for teams who need MySQL at scale with DevOps features.

If you're choosing between PostgreSQL and MySQL, you're already overthinking it—both are solid. The real question is whether you want a database plus everything else (Supabase) or just a highly reliable database with killer ops tooling (PlanetScale).

Where Supabase Wins

Supabase wins on developer velocity. You get a PostgreSQL database, but also instant authentication (with social logins, magic links), realtime subscriptions via websockets, and storage for files—all in one dashboard. Their free tier is generous: 500MB database, 1GB file storage, and 50k monthly active users for auth. Pricing scales predictably: $25/month for the Pro plan with 8GB database and 100GB storage.

For startups or solo devs, this means you can skip setting up separate services for auth or realtime. The built-in SQL editor and table view let you manage data without a third-party tool. It's like getting Firebase but with PostgreSQL and actual SQL—not some NoSQL abstraction.

Where PlanetScale Holds Its Own

PlanetScale excels at MySQL reliability and scaling. Their branching feature lets you create database branches for development or testing, with zero-downtime schema changes via deploy requests. This is a game-changer for teams with CI/CD pipelines. The free tier includes 10GB storage and 1 billion row reads/month—more than enough for many apps.

If you're committed to MySQL (maybe due to legacy code or team preference), PlanetScale is the best managed option. Their Vitess-based architecture handles sharding and scaling transparently, and support for preview databases makes it easy to test changes. It's MySQL without the operational headaches, priced from $29/month for the Scaler plan.

The Gotcha: Switching Costs and Lock-in

Supabase's tight integration is a double-edged sword. If you use their auth and realtime, migrating away means rewriting significant parts of your app. Their APIs are proprietary, though built on open standards. PlanetScale is more straightforward—it's just MySQL, so you can move to another MySQL host with less pain, but you'll lose the branching and DevOps features.

Also, Supabase's realtime is great for simple use cases, but for high-volume messaging, you might hit limits (e.g., 100 concurrent connections on the free tier). PlanetScale's serverless driver requires specific configuration for optimal performance, which adds complexity. Neither tool is "set and forget"—you'll need to tune as you scale.

If You're Starting a Project Today

Go with Supabase if you're building a new web or mobile app and want to move fast. Use their Next.js or Flutter starters, and you'll have auth, a database, and realtime in hours. It's perfect for MVPs or small teams where backend expertise is limited.

Choose PlanetScale if you're scaling an existing MySQL app or need strict DevOps practices. Their branching fits well with GitHub workflows, and the ability to revert schema changes is worth the price for production systems. Avoid it for greenfield projects unless MySQL is a hard requirement.

What Most Comparisons Get Wrong

They treat this as a pure database shootout, but Supabase and PlanetScale solve different problems. Supabase isn't trying to be the best PostgreSQL host—it's trying to eliminate backend boilerplate. PlanetScale isn't trying to be a backend platform—it's optimizing MySQL for modern development workflows.

The real question isn't "Which database is better?" It's "Do you need a backend platform or a database with superior ops?" If you answer that, the pick is obvious. And no, you can't just "add auth later" without significant refactoring—so choose based on your full stack needs, not just the database engine.

Quick Comparison

Factor	Supabase	PlanetScale
Database Engine	PostgreSQL 15+ with extensions	MySQL 8.0+ (Vitess-based)
Free Tier	500MB database, 1GB storage, 50k MAU auth	10GB storage, 1B row reads/month, 3 branches
Starting Paid Plan	$25/month (Pro: 8GB database, 100GB storage)	$29/month (Scaler: 10GB storage, 1B row reads)
Built-in Auth	Yes (social logins, magic links, row-level security)	No (requires external service)
Realtime Features	Websockets for database changes, 100 concurrent free	None (requires external service)
Schema Changes	Standard PostgreSQL migrations	Zero-downtime via deploy requests, branching
Storage	Integrated file storage (S3-compatible)	None (database only)
Max Connections	500 on Pro plan	Unlimited (serverless driver)

The Verdict

Use Supabase if: You're building a new app and want auth, realtime, and storage without juggling multiple services. Ideal for startups or solo devs using React, Flutter, or similar.

Use PlanetScale if: You need MySQL at scale with DevOps features like branching and zero-downtime schema changes. Best for teams with existing MySQL apps or strict CI/CD requirements.

Consider: Neon (serverless PostgreSQL) if you want PlanetScale-like branching for PostgreSQL without Supabase's extra features—good for pure database needs.

The Bottom Line

Supabase wins

Supabase isn't just a database—it's auth, realtime, and storage baked into PostgreSQL. If you're building from scratch, it's a no-brainer for speed and simplicity.

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