I am looking for a WebSocket-enabled PAAS service. So far I have only experimented on Heroku and it works quite fine. Would you recommend other services?
Side question: I'm slightly worried about the billing. In the case of Heroku, it seems that usage is calculated via the time dynos are busy. I guess that in case of a Websocket connection, there may be a lot of idle time in between data exchange, and it would be fully billed anyway. Is that correct?
Heroku will bill you for the time the dyno is up, whether or not it is being used at all.
We've used Pusher as a complete websocket service, which allows you to asynchronously publish events from your main Heroku app and off-load the websocket connections and event publishing to Pusher.
They charge based on the volume of websocket traffic, which might be cheaper if you have a small volume or peaky traffic, and don't want to pay for a consistent set of dynos needed to service your peak traffic.
