[xlazom00]

On windows 8 and newer, microsoft use new framework to create UI for apps. They are all GPU accelerated. Calculator, Settings,.. And it is up to the framework if it support all feature like accesiblity or system spellcheck or whatever.

And on Mac OS Cocoa use GPU acceleration as well.

As if you want to show something nice and fency you will need GPU acceleration. But still you can fall back to CPU rendering. There is Open GL on CPU in MESA. same for DirectX. It is shower for some fency stuff but good enought for basic UI