Azure Cosmos DB is described as 'NoSQL document database service designed from the ground up to natively support JSON and JavaScript directly inside the database engine. It’s the right solution for web and mobile applications when predictable throughput, low latency, and flexible query are' and is an website in the development category. There are more than 50 alternatives to Azure Cosmos DB, not only websites but also apps for a variety of platforms, including Linux, Windows, Mac and Self-Hosted apps. The best Azure Cosmos DB alternative is SQLite, which is both free and Open Source. Other great sites and apps similar to Azure Cosmos DB are PostgreSQL, MySQL Community Edition, MongoDB and MariaDB.