Azure Cosmos DB vs PlanetScale

Azure Cosmos DB is a globally distributed, multi-model database service by Microsoft offering single-digit millisecond latency and 99.999% availability SLA. It supports document, key-value, graph, and column-family data models with multiple API options.

PlanetScale is MySQL-compatible serverless database platform built on Vitess with schema branching and zero-downtime migrations.. It is available under a paid model. This tool falls under the databases category.