Side-by-side comparison

Hadoop-era wide-column store modeled on Bigtable; still in big installs but rarely chosen for new projects.

The most popular document database, with flexible JSON-like documents, aggregation and Atlas cloud.

Masterless wide-column database for massive write throughput and multi-datacenter availability.

Cassandra- and DynamoDB-compatible wide-column database in C++ with much lower tail latency.