Apache Cassandra: open source alternative to Amazon Keyspaces

NoSQL data store using the Seastar framework, compatible with Apache Cassandra and Amazon DynamoDB

Speaks CQL, reads Cassandra SSTables and works with the same drivers and nodetool; triggers, Java UDFs and SAI indexes are missing.

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Amazon KeyspacesKeyspaces implements Cassandra's CQL API, so drivers and queries carry over; IAM authentication becomes Cassandra roles.Drop-in
Astra DBAstra DB is built on Cassandra, so CQL tables and drivers carry over; the Data API and serverless scaling do not.Full replacement
Amazon DynamoDBPartitioned wide-column tables with tunable consistency through CQL, not the DynamoDB API.Partial

Apache Cassandra