Azure Cosmos DB vs RocksDB

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.

RocksDB is Embeddable persistent key-value store from Meta optimized for fast storage, forked from LevelDB.. It is available under a free model. This tool falls under the databases category.