Supabase vs PlanetScale: Full Backend vs Pure Database?

Supabase and PlanetScale both offer managed database platforms, but their philosophies are fundamentally different. Supabase is an open-source Firebase alternative built on PostgreSQL that provides a complete backend — database, authentication, file storage, real-time subscriptions, and edge functions in a single platform. PlanetScale is a serverless MySQL platform built on Vitess (the technology that scales YouTube's database) that focuses exclusively on being the best possible managed MySQL experience.

The core question is whether you want an all-in-one backend platform or a specialised database service. Supabase gives you everything you need to build a complete application without stitching together multiple services. PlanetScale gives you a world-class database and expects you to bring your own authentication, storage, and real-time layer. For teams that already have opinions about their auth and storage solutions, PlanetScale's focused approach can be preferable. For teams starting fresh, Supabase's integrated platform significantly reduces decision fatigue and setup time.

Supabase runs on PostgreSQL, widely regarded as the most advanced open-source relational database. Postgres supports JSON/JSONB columns, full-text search, array types, window functions, CTEs, and an enormous extension ecosystem including PostGIS for geospatial queries and pgvector for AI embeddings. For applications that need flexible data modelling, Postgres is exceptionally capable.

PlanetScale runs on MySQL via Vitess, which was purpose-built at Google for horizontal scaling. MySQL is the world's most popular open-source database, powering roughly 43% of production databases globally. PlanetScale's Vitess layer adds non-blocking schema changes, horizontal sharding, and connection pooling — features that are critical at scale but rarely needed for early-stage applications.

For most applications under 10 million rows, both databases perform comparably. The practical differences emerge at scale: PlanetScale's sharding capabilities handle massive write volumes more gracefully, while Postgres's richer feature set (particularly JSONB and extensions) reduces the need for additional services. If your team already has MySQL expertise, PlanetScale leverages that directly. If you are starting fresh, PostgreSQL's broader feature set is the more future-proof choice.

Supabase includes a complete authentication system supporting email/password, magic links, OAuth providers (Google, GitHub, Apple, and dozens more), and phone authentication — all without additional configuration or cost. Supabase Auth integrates directly with Row Level Security (RLS) policies in Postgres, so your authorisation rules live in the database layer. This is a significant architectural advantage: your data access rules are enforced regardless of which client or API accesses the database.

Supabase also provides real-time subscriptions via Postgres's built-in replication, file storage backed by S3-compatible object storage, and edge functions for serverless compute. These features cover roughly 80% of what a typical web application backend needs.

PlanetScale includes none of these features. It is purely a database platform. You will need to integrate a separate authentication service (Clerk, Auth0, or similar), a file storage service (AWS S3, Cloudflare R2), and a real-time solution (Pusher, Ably, or similar). This adds complexity and cost, but gives you complete freedom to choose best-in-class solutions for each concern. For teams with strong infrastructure opinions, this modularity is a feature, not a limitation.

PlanetScale removed its free tier in April 2024, which was a watershed moment for many developers and startups. Their Scaler plan starts at $39/month for 10GB storage and 1 billion row reads. The Scaler Pro plan at $99/month adds more storage and read/write capacity. For high-volume applications, costs scale with usage but remain predictable.

Supabase maintains a generous free tier: 500MB database storage, 1GB file storage, 50,000 monthly active users for auth, and 500MB bandwidth. The Pro plan at $25/month increases limits substantially and adds daily backups, 8GB database space, and 250GB bandwidth. Additional usage is billed at transparent per-unit rates.

For a startup or side project, Supabase's free tier is a clear advantage — you can build and launch without any database costs. PlanetScale requires a paid plan from day one. At scale, the comparison becomes more nuanced: PlanetScale's pricing is purely database-focused, while Supabase's pricing bundles auth, storage, and real-time. When you factor in the cost of separate auth and storage services alongside PlanetScale, Supabase's bundled pricing is often more economical for small-to-medium applications.

PlanetScale's standout feature is database branching — the ability to create isolated branches of your database schema, test changes, and merge them via deploy requests, similar to Git pull requests. This workflow is transformative for teams that make frequent schema changes, as it eliminates the risk of breaking production with a bad migration. Non-blocking schema changes mean zero-downtime deployments, even for tables with billions of rows.

Supabase offers a dashboard with a built-in SQL editor, table viewer, and real-time logs. The local development experience uses Docker to run a full Supabase stack locally, with migration management through the Supabase CLI. While functional, the local development setup is heavier than PlanetScale's CLI-driven workflow.

Both platforms provide excellent client libraries. Supabase's JavaScript client (supabase-js) handles auth, database queries, storage, and real-time subscriptions in a single SDK. PlanetScale works with any MySQL client library, giving you full flexibility but requiring more setup. Supabase's auto-generated TypeScript types from your database schema provide type-safe queries out of the box — a significant productivity boost for TypeScript projects.

PlanetScale was built for scale from the ground up. Vitess, its underlying technology, handles YouTube's database traffic — one of the highest-throughput workloads on the internet. PlanetScale offers horizontal sharding, read replicas in multiple regions, and connection pooling that handles thousands of concurrent connections without breaking a sweat. For applications expecting millions of users or billions of rows, PlanetScale's architecture is purpose-built.

Supabase scales vertically by upgrading your Postgres instance. The Pro plan runs on a dedicated 2-core, 4GB RAM instance, with larger instances available on higher tiers. Supabase added read replicas in 2024 and connection pooling via PgBouncer, which handles most scaling needs for applications up to hundreds of thousands of concurrent users. However, Postgres's single-primary architecture means write scaling eventually hits limits that PlanetScale's sharding avoids.

For the vast majority of applications — those serving under 100,000 daily active users — both platforms handle the load without issue. The scaling differences only become material at significant scale, and by that point, most teams have the engineering resources to manage the transition if needed.

Moving between Supabase and PlanetScale means migrating between PostgreSQL and MySQL — two different SQL dialects with different type systems, function syntax, and feature sets. This is not a trivial migration. Postgres-specific features like JSONB operators, array columns, and extensions (pgvector, PostGIS) have no direct MySQL equivalents. Similarly, MySQL-specific syntax and behaviours need adjustment when moving to Postgres.

If you are currently on PlanetScale and considering Supabase, the migration path involves converting your MySQL schema to Postgres, adjusting queries that use MySQL-specific syntax, and adding Supabase's auth and storage to replace whatever services you were using alongside PlanetScale. Tools like pgloader can automate much of the data migration, but schema and query adjustments require manual work.

If you are on Supabase and considering PlanetScale, you will need to extract the database layer, convert Postgres schema and queries to MySQL, and set up separate services for auth, storage, and real-time. This is a larger undertaking because you are unbundling an integrated platform.

The key takeaway: your initial database choice has long-term implications. Choose deliberately, because switching later is expensive in engineering time.

For most developers building new applications in 2026, Supabase is the stronger choice. The combination of a free tier, integrated auth and storage, PostgreSQL's rich feature set, and an active open-source community makes it the more practical starting point. You get a complete backend from a single provider, which reduces operational complexity and cost.

Choose PlanetScale if you have specific requirements that favour it: existing MySQL expertise or a large MySQL codebase to migrate, a need for database branching workflows in a large team, or an application that will genuinely need horizontal sharding at scale. PlanetScale excels as a pure database platform, and if you already have solutions for auth, storage, and real-time, its focused approach avoids unnecessary bundling.

For startups and indie developers, Supabase's free tier and all-in-one approach remove significant friction. For enterprise teams with established infrastructure, PlanetScale's database branching and Vitess-powered scaling may justify the additional integration work. The removal of PlanetScale's free tier has made Supabase the default recommendation for anyone exploring either platform without existing MySQL commitments.