I just submitted a minor update to www.cut that improves its iOS 9 support.
It now works with side-by-side multi-tasking and fills the screen of an iPad Pro (I say fills rather than uses as it’s hard to make a couple of text boxes and three buttons to use a 12″ screen!).
Apple have been taking about a week to approve updates, so fingers crossed. (However, it’s only fair to note that it took several attempts to get 3.3 on the App Store.)