If you wonder how come it works on so many devices, this is because KDE is written using QT, which uses C++ and hence is compatible on devices which have a c++ compiler for it's CPU.

It works on Linux, Windows, IOS, Android and probably other minor devices using Plasma Mobile. Use everyday Android <-> Linux, but you can use it as IOS <-> Windows. You can send an receive clipboard, files, etc. During movie times I use KDE connect as a remote control to do play/pause! It also works as a channel Android <-> IOS, just tested it.