Kestrel vs Mosca: What are the differences?

Kestrel: Simple, distributed message queue system. Kestrel is based on Blaine Cook's "starling" simple, distributed message queue, with added features and bulletproofing, as well as the scalability offered by actors and the JVM; Mosca: A Node.js MQTT broker. A Node.js MQTT broker, which can be used as a Standalone Service or embedded in another Node.js application.

Kestrel and Mosca belong to "Message Queue" category of the tech stack.

Some of the features offered by Kestrel are:

• Written by Robey Pointer
• Starling clone written in Scala (a port of Starling from Ruby to Scala)
• Queues are stored in memory, but logged on disk

On the other hand, Mosca provides the following key features:

• MQTT 3.1 and 3.1.1 compliant
• QoS 0 and QoS 1
• Various storage options for QoS 1 offline packets, and subscriptions

Kestrel and Mosca are both open source tools. It seems that Mosca with 2.84K GitHub stars and 501 forks on GitHub has more adoption than Kestrel with 2.8K GitHub stars and 326 GitHub forks.