[microtonal]

I co-developed a Qt C++ app of ~40,000 lines. I think the amount of platform-specific code was at most a couple of pages (handling macOS' behavior to keep an app alive when all its windows are closed).

It is not perfect, but it feels a lot more native on every platform than virtually any web or electron app I have seen (including predictable keyboard shortcuts).

[rocky1138]

I don't have a large amount of experience but when I worked with Qt I was blown away with how friendly and cross-platform it all was. It's pretty close to write once, compile to anything.