I don't think it's Qt. It's another thin window layer, duilib I think? Their Windows SDK demo pages certainly use it anyway. duilib is here: https://github.com

I don't think it's Qt. It's another thin window layer, duilib I think? Their Windows SDK demo pages certainly use it anyway. duilib is here: https://github.com/duilib/duilib https://github.com/duilib/duilib Using the Zoom SDK with its many spelling mistakes and broken English comments, I am sure that a Chinese UI toolkit would be preferable to Zoom, since their development team really does seem to be Chinese.