Calc Tap by Stéphan Barbé
Calc Tap is an elementary calculator that has an interactive paper tape, with a clean and simple user interface.
It allows you to scroll through your calculations, and you can tap once on any of your operations or results and Calc Tap will copy whatever you tapped to the bottom of your calculations where you can continue to use the calculator.
Calc Tap includes a funny text-mode:
flip your iPhone once and all of your numerical calculations will change to text!
Calc Tap is 1.99 in the iTunes App Store
Developer Website: http://iphone.stephanbarbe.de/