PlanetScale

PlanetScale is a San Francisco database company that turns the hard parts of running relational databases at scale into a managed cloud service. Founded in 2018 by the creators of Vitess - the MySQL-sharding system built at YouTube and later used by Slack, GitHub and Square - the company sells a serverless database platform known for non-blocking schema changes, branching workflows borrowed from Git, and, more recently, Metal instances built on locally-attached NVMe drives. In 2025 it extended the same platform to Postgres, chasing the fastest-growing part of the database market while still, in its own words, loving MySQL.