Yeah, I wrote those bindings, though they're incomplete, and libui's memory management is so broken that I lost interest in finishing them.

It's a fair point, however. :) Much of my interest in libui was (a) to provide platform support for the browser engine; (b) to provide a solution for simple projects that don't want large dependencies. I've always believed the native UI frameworks from the '90s to be poor fits for modern graphics hardware. But sometimes your workload is so simple you don't care about whether your UI is as fast as possible, and minimizing dependencies is a more important criterion. That's where simple native UI layers can be a good fit.