Picking a managed database in 2026 is mostly a choice between two philosophies: do you want a database, or do you want a backend? Supabase and PlanetScale sit on opposite sides of that line, and the difference matters more than the marketing pages let on.
This isn't a fight between MySQL and Postgres anymore — PlanetScale ships both. The real question is whether you need horizontal sharding at scale, or a batteries-included backend you can ship a product on by Friday.
Why This Comparison Matters
Most teams pick a database the way they pick a JavaScript framework: defaults, vibes, and what the last engineer used. That's fine until you hit 10 million rows, or your auth provider sends you a bill, or your read replicas start lagging.
Supabase and PlanetScale both started by fixing a real problem with Postgres-as-a-service. Supabase wrapped Postgres with auth, storage, realtime, and edge functions — a Firebase replacement that doesn't lock you into Google's document model. PlanetScale wrapped Vitess (the sharding layer YouTube built on top of MySQL) and later added Postgres, targeting teams who outgrew vanilla RDS.
They overlap on the database layer. They don't overlap on anything else.
Feature Comparison Table
| Feature | Supabase | PlanetScale |
|---|---|---|
| Database engine | Postgres | Postgres + MySQL (Vitess) |
| Horizontal sharding | No (vertical scale only) | Yes (Vitess-native) |
| Built-in auth | Yes (20+ providers) | No |
| File storage | Yes (S3-compatible + CDN) | No |
| Realtime subscriptions | Yes (WebSockets) | No |
| Edge functions | Yes (Deno) | No |
| Auto-generated APIs | REST + GraphQL | No |
| Database branching | Yes | Yes (the original) |
| Row Level Security | Yes (Postgres-native) | App-layer only |
| Vector search | Yes (pgvector) | No native support |
| Open-source / self-host | Yes | No |
| Free tier storage | 500 MB | 5 GB |
| Best for | Full-stack apps | High-scale workloads |
Pricing Comparison
Free Tier
PlanetScale wins this round on raw database limits. Its Hobby tier gives you 5 GB of storage, 1 billion row reads, and 10 million row writes per month — generous if all you need is a database. Supabase Free caps the database at 500 MB but throws in 1 GB of file storage, 50,000 monthly active users for auth, and 500K edge function invocations. Different scopes, hard to compare apples-to-apples.
One catch on Supabase Free: projects pause after a week of inactivity. PlanetScale's Hobby tier doesn't. If you're prototyping intermittently, that matters.
Paid Tiers
Supabase Pro is $25/mo for 8 GB database, 100 GB file storage, 100K MAU, 2M function invocations, and daily backups. PlanetScale Scaler is $39/mo for 10 databases, 10 billion reads, 100M writes, 50 GB storage, and horizontal sharding.
Supabase Pro is cheaper and bundles more services. PlanetScale Scaler is more database for the dollar if database is all you need.
Enterprise
Supabase Team jumps to $599/mo for SOC2, SSO, HIPAA add-on, and SLA. That gap from $25 to $599 is the most-cited complaint about Supabase pricing. PlanetScale Enterprise is custom-quoted with dedicated support and private cloud options — expect to talk to sales, expect a five-figure annual minimum.
Use Case Scenarios
Pick Supabase if:
- You're shipping a full-stack app from zero. Auth, database, storage, realtime, and edge functions in one dashboard means you're not stitching together five vendors before you've written a feature.
- You need Postgres extensions. pgvector for AI apps, PostGIS for geospatial, Row Level Security for multi-tenant isolation — Supabase exposes all of it.
- You want an exit ramp. Self-hosting is a real option. If Supabase's pricing changes or you outgrow it, you can run the same stack on your own infrastructure.
- Realtime matters. Live cursors, chat, presence, dashboards — Supabase's Realtime is built into the platform. Doing this on PlanetScale means writing your own WebSocket layer.
Pick PlanetScale if:
- You expect to shard. If your data model is genuinely going to outgrow a single Postgres instance, Vitess is the most battle-tested sharding layer on the planet. YouTube, Slack, and GitHub run on it.
- You're already on MySQL. Supabase is Postgres-only. PlanetScale gives you a managed MySQL path with the same branching workflow.
- Performance is non-negotiable. NVMe storage, unlimited IOPS, and Vitess's connection pooling handle workloads that would crater a single-instance Postgres.
- You already have auth, storage, and a backend. If you're slotting a database into an existing stack, Supabase's bundled services are dead weight you're paying for.
Verdict
For most teams in 2026, Supabase is the better default. It's not the better database — it's the better starting point. You get Postgres with extensions, auth that works on day one, and a free tier that handles real prototypes. The $25 Pro plan covers production workloads for the long tail of apps that will never need sharding.
For teams with scale in their near future, PlanetScale is the right call. If you're building something where "horizontal sharding" is a sentence that will come up in the next 18 months, start there. Retrofitting Vitess later is harder than learning it upfront.
The honest mistake to avoid: don't pick PlanetScale because it sounds more serious. The teams that actually need its scale know they need it. Everyone else is paying a complexity tax for a problem they don't have yet.
Score: Supabase 9.1 / PlanetScale 8.2 — but those numbers hide the real answer, which is that they're solving different problems. Pick the one solving yours.