Hacker News Reader

Native code, not native UI (whatever that means, these days)

Actually, on Windows GTK uses native widgets.

No, using DrawFrameControl et al does not make a widget native.

What is native these days? They seem to have a new UI toolkit every 2 years.

The only native controls on Windows are the classic Win16/Win32 controls, accept no substitutes (not even that new-fangled comctl32 thing).

Is Outlook even native these days?

Cloud Native, the only type of native that matters these days ;-)