Well this app is interesting, and one of the only apps with a fake calculator, making it unique. It is fun at first, but a little slow on commands (you have to sometimes tap things twice) and it freezes whenever I want to tap "C"
It bothers me, and also there should be a way to hide the little "i" button (instructions) because anyone using it could look at it. (for example, when you swipe to the right, it makes the instructions screen show, instead of the button) thats all. Good app by the way just its a little slow and needs graphic improvement.