Hi all,

this is our new calculator, already established for years on the iPhone,
and now finally available for the iPad:

Click image for larger version. 

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CalcTape is a revolutionary new kind of pocket calculator. With CalcTape, also extensive calculations remain clearly structured. CalcTape makes the arithmetic process visible - you can generate intermediate results and subsequently correct or change all numbers and operations.

Here are 5 promo codes to give a first taste:
ANTR77HRXRN6
XMEXYTERAWL3
PTHLNFKPLHE4
WN49XF4M7LFE
W9E9LXHWNJHA