FerretDB

FerretDB is a MongoDB-compatible layer. Rather than being a storage engine of its own, it is described as storing data in another database backend, which allows applications written for MongoDB drivers to talk to a different underlying database. Its code and releases are published on GitHub, and its website is ferretdb.com.

The latest release is v2.7.0, dated 10 November 2025. Buyers should look at the release feed to judge how actively the project is currently maintained before adopting it for a long-lived system.

Buyers should confirm the licence terms in the project’s repository. Because FerretDB sits between an application and its data, the exact terms matter and buyers should confirm them for the version they plan to run. The company or foundation responsible was not named, nor were the deployment options, any commercial or managed editions or the pricing, so all of these should be established with the project directly.

The compatibility approach can reduce the effort of moving off MongoDB, but compatibility is rarely complete. Teams should test the particular queries, aggregation stages, indexes and drivers they depend on against FerretDB before committing, and should confirm which backend databases are supported and how they are operated.