Free
Self-hosted
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Write a ReviewYes, Apache Cassandra is free and open source. Apache 2.0 license. Commercial support available from DataStax.
Cassandra is a distributed NoSQL database. High availability, no single point of failure. Used by Netflix, Apple, and more.
Cassandra excels at write-heavy workloads. MongoDB is more flexible for queries. Cassandra for scale; MongoDB for flexibility.
High write throughput, global distribution, always-on requirements. Time-series data, IoT, messaging. Not for complex queries.