Is KeyCue compatible with macOS Ventura?

Yes, in general the current version 10.1 of KeyCue runs on macOS Ventura.

We are in the process of preparing a maintenance release that irons out some small Ventura compatibility issues and will release a beta of KeyCue 10.2 soon. We recommend turning on the "also check for beta versions" in KeyCue Settings -> "About KeyCue", such that you will be informed as soon as we have released the beta.