I've also played around with the Rust version egui, and with the eframe template it's super easy to bang out super quick GUI tools on github pages (for example, I made a basic guitar fretboard chord finder [1] to help me learn guitar in a few hours, plus a few more hours refining it)
The mental model of immediate mode guis makes it really easy to work on it as a side project with 10-20 minutes here or there before bed, though doing proper layout to make it look nice is sometimes a challenge. The other advantage is that I can just jump into the implementation, and the egui code itself is pretty easy to grok.