How is this different from Signal R? Signal R provides Real-time Duplex communication. It's dead-simple to use and it's FREE. <a href="https://github.com/SignalR/SignalR" rel="nofollow">https://github.com/SignalR/SignalR</a><p>I looked at ably.io's features / platform page <a href="https://www.ably.io/platform" rel="nofollow">https://www.ably.io/platform</a> and don't see anything that Signal R can't do.<p>Can someone from ably.io convince me as to why I should be shelling out 500$ a month (as an enterprise client) to use ably.io? The only reason I see is an existing technology stack that can't allow or handle Signal R (.Net) and that's a weak argument.