ably vs SocketCluster: What are the differences?

ably: A platform that makes it easy for you to add realtime messaging, notifications and streaming data to your applications. It enables any internet enabled device on the planet to publish data streams to any number of subscribers in milliseconds. Our infrastructure spans over 20 data centres globally ensuring low latency performance, redundant storage of all data and commitment to meet our guaranteed quality of service promise; SocketCluster: An open, scalable realtime engine for Node.js. SocketCluster is a fast, highly scalable HTTP + realtime server engine which lets you build multi-process realtime servers that make use of all CPU cores on a machine/instance. It removes the limitations of having to run your Node.js server as a single thread and makes your backend resilient by automatically recovering from worker crashes and aggregating errors into a central log.

ably and SocketCluster belong to "Realtime Backend / API" category of the tech stack.

SocketCluster is an open source tool with 5.35K GitHub stars and 283 GitHub forks. Here's a link to SocketCluster's open source repository on GitHub.