WebSockets client for Objective-C (preferably iOS compatible)

You can check out the UnitT Web Socket Client. It is intended for use in iOS apps using Objective-C. It works with both ws & wss.

I am the author and have been using it in some of my projects with success. Let me know if you run into any trouble and I will do what I can to help.

Found this post in a google search for iOS WebSockets and wanted to put an updated answer.

Anyways, Zimt and Unitt's client don't support the latest standard (at the time of writing this).

(disclaimer: author of SocketRocket)

We just released a new library that has no external dependencies, supports RFC 6455 completely, and works with iOS 4.x+.

It's called SocketRocket and can be found here