By Kristoffer Gustafsson, 22 December, 2018 Forum iOS and iPadOS Hi. If I buy knfb reader. Can I use it on both my iphone and the ipad, or do I need to buy two licenses. one for the ipad, one for the iphone? /Kristoffer Options Log in or register to post comments Comments Apple's licensing System Hi, Licenses for apps are tied to your apple ID, so you can buy on one device and any other compatible devices logged into that account can use it as well.