Turso vs PlanetScale

Turso and PlanetScale are both modern managed databases, but they solve different problems. Turso brings SQLite to the edge with embedded replicas. PlanetScale brings MySQL horizontal scaling with Vitess.

Architecture Differences

Turso: SQLite at the Edge

Turso is built on libSQL, an open-source fork of SQLite that adds server mode and replication. The key innovation is embedded replicas — your application can embed a local copy of the database that syncs with the primary. Reads hit the local replica (sub-millisecond), while writes go to the primary and propagate to all replicas.

This architecture is ideal for edge computing, where your application runs in many locations (Cloudflare Workers, Fly.io, etc.) and needs fast local reads.

PlanetScale: Vitess-Powered MySQL

PlanetScale is built on Vitess and provides horizontal MySQL scaling with automatic sharding. Its branching model lets you create schema branches, test changes in isolation, and deploy with non-blocking online DDL.

Multi-Tenancy

Turso excels at database-per-tenant architectures. You can create thousands of databases cheaply, each isolated and independently manageable. PlanetScale handles multi-tenancy through table-level or schema-level separation within a single database.

Learn about database architecture patterns in system design concepts and interview questions.

Trade-Offs

Turso's SQLite foundation means limited SQL dialect support compared to MySQL. Complex JOINs, stored procedures, and some MySQL-specific features are not available. PlanetScale's lack of foreign key constraints (Vitess limitation) is a notable gap.

The Bottom Line

Choose Turso when you need edge-replicated databases with sub-millisecond reads and database-per-tenant isolation. Choose PlanetScale when you need horizontally scalable MySQL with safe schema migrations. Compare pricing and see system design guides.