Yes, and it's great. But you can't iMessage / SMS or get Notifications with iPhone.

My absolute favorite feature in KDE Connection is full audio device output / input control remotely so I can silence notifications without getting up or start playing music through the speakers.

It even works on Windows.

yes, there's even a GNOME shell extension[0] that implements the KDE Connect protocol without needing the official KDE version.

[0]: https://github.com/GSConnect/gnome-shell-extension-gsconnect