MongoDB

MongoDB is a document database available three ways: Atlas as a fully managed multi-cloud service on Amazon Web Services, Azure and Google Cloud, Enterprise Advanced for organisations running it themselves, and Community Edition as a free local build.

Offering the same database as a managed service, a supported self-managed product and a free download is the commercially important part, because it removes the decision that usually blocks adoption. A team can develop locally on Community Edition without a contract, move to Atlas when the application needs operating, and fall back to Enterprise Advanced if regulation forces the workload on premises, all without changing database. Few competitors offer all three credibly.

Atlas being genuinely multi-cloud rather than nominally so matters for the same reason. A managed database available on only one hyperscaler ties an application to that provider more firmly than most other services do, since data has gravity and migrating a live database is the hardest move in any cloud exit, which is the dependency MongoDB avoids.

The platform has grown well past storage, with full-text Search, Vector Search for generative AI applications, and Stream Processing integrating with Kafka, all on the same data rather than in bolt-on systems. Compass provides a graphical interface, Relational Migrator handles moving off a relational database, and version 8.0 is described as the fastest yet. Atlas Free costs nothing per hour with 512MB of storage on shared resources, Flex is 0.011 dollars an hour capped around 30 dollars a month with 5GB, and Dedicated starts at 0.08 dollars an hour or 56.94 dollars a month.