Universal Control can be used with up to two other devices, in addition to a Mac. That means you can use it with a Mac and two iPads, two Macs and one iPad, or three Macs (look at you!). First, if ...

Note that while ‌Universal Control‌ lets you use your Mac's keyboard and trackpad to navigate your ‌iPad‌, it functions over two different operating systems – macOS and iPadOS.