Just Downloaded Astopad for iPad. I am able to run drawing apps on Mac Air. Think it'll work on normal desktops and laptops as it has an app that loads on the PC.

U can load the iPhone version for free buts a bit small to work with. It's possible to it look at the screen as well using the iPad trackpad with a bit of practice.

Will be even better with IPad Pro I think. Very handy propped up in a comfortable chair haha!