We're putting the final touches on a new check type for WebSockets (including Socket.io) and are looking for some folks with such services to test it and offer their feedback.
If you have WebSocket services and are interested in kicking the tires, please sign up for a free trial at https://nodeping.com and let us know you're testing the new WebSocket check via email to support@nodeping.com and we'll add an additional 15 days to your trial.
Documentation on the check can be found at https://nodeping.com/WebSocket_Check.