http://iscoresports.com/

This may have been brought up already but I would love love love an undo or back button inside the pop up for each play. It's so frustrating to enter a complicated play and accidentally touch the wrong button or have the call changed. A back or undo button would be ever so helpful to not miss the next pitches or plays because you are backing up to reenter information.

On an iOS device, if you "shake" it, it will let you cancel out of play entry to re-enter. On an Android device, there is a Back button to cancel out.