Can PubNub support millions of users and millions of channels? Craig Conover November 10, 2020 10:15 Updated Creating and using millions of channels (and users/devices) poses no technical challenge to PubNub (it is why PubNub exists - the service that is provided is to scale to millions). See also: How many concurrent connections can I use? Related articles How many concurrent connections can I use? What are valid channel names? How many channels can I use? What is a channel? Does PubNub use WebSockets or some other protocol?