[c-smile]

Just to get a feeling, see screenshots of Sciter Notes application on major desktop platforms: https://notes.sciter.com/

The application uses exactly same code on all platforms: https://github.com/c-smile/sciter-sdk/tree/master/notes

It even runs on Windows 2000: https://sciter.com/necromancing-sciter-on-windows-2000/

[flingo]

Is there any way to get a GPL-compatible version of Sciter?

I couldn't tell, just from glancing at the website/github.