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Hello! We have a backend service using <http://socket.io|socket.io> . Is it possible to use ktor (with websockets plugin) on our client apps to communicate with it?

Ktor supports websockets, then I don't see why it couldn't be possible :slightly_smiling_face:

Out-of-the-box no. You'd have to implement the <https://socket.io/docs/v4/socket-io-protocol/|Socket.IO><https://socket.io/docs/v4/socket-io-protocol/| protocol>. Also, there is a pending <https://youtrack.jetbrains.com/issue/KTOR-448|feature request> of having the implementation of that protocol in Ktor.