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Fast embeddable persistent and in-memory key-value storage engine that provides storage as simple data structures - Map, Set & Queue.

Conditional updates/data modifications can be performed by simply submitting any Java, Scala, Kotlin or any native JVM code.

SwayDB's configurations can be tuned for various workloads. Some use-cases are:

  • General key-value storage
  • Message queues
  • Time-series or Events data
  • Archiving data or cold storage with high file level compression

See comparable benchmarks with RocksDB or QuickStart in Java, Scala or Kotlin.

Documentation | License summary | Project status


Storage type Performance
Persistent up to 863,000 reads/sec & 482,000 writes/sec
Memory TODO


Read more.

Quick start

Project status

Your feedback and review is very important to get to production. Please get involved via chat, issues or email which is on my profile.

Undergoing beta & performance testing. Backward binary compatibility is not yet a priority for minor releases unless it's requested.

See tasks labelled Production release that are required before becoming production ready.

Related GitHub projects


Contributions are welcomed following the Scala code of conduct.

License summary

Would like to see others find SwayDB useful in their own projects, companies and other open-source projects for both personal or commercial reasons, the license only asks for your modifications (e.g bug-fixes) to SwayDB's source code to be shared so that it supports the contributors by not duplicating efforts. You do not have to share your program's code or are bounded by AGPLv3 as long as you share your modifications.

If you have any questions or think that the current license restricts you in any way please get in touch.

The language in the LICENSE file follows GNU's FAQ so that it is correct in legal terms.


Thank you Jetbrains for providing an open-source licence for their awesome development tools.

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