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Horizon vs Radar: What are the differences?
What is Horizon? *A realtime, open-source JavaScript back end from RethinkDB *. Horizon provides a complete backend that makes it dramatically simpler to build, deploy, manage, and scale engaging JavaScript web and mobile apps. Horizon is extensible, integrates with the Node.js stack, and allows building modern, arbitrarily complex applications.
What is Radar? High level API and backend for writing web apps that use push messaging. Radar is built on top of engine.io, the next-generation backend for socket.io. It uses Redis for backend storage, though the assumption is that this is only for storing currently active data.
Horizon and Radar can be primarily classified as "Realtime Backend / API" tools.
Horizon and Radar are both open source tools. It seems that Horizon with 6.77K GitHub stars and 389 forks on GitHub has more adoption than Radar with 209 GitHub stars and 35 GitHub forks.