Wonderful basic calculator
I bought PCalc for my iPhone because it had the engineering calculations I needed, all of the conversions I was looking for, an adequate list of constants, by rotating the screen I could change the keyboard from engineering to programming (that’s really nice) and there was enough diversity in the layout and theme libraries that I could find a comfortable look and feel. All of that said, I bought PCalc for my PowerBook because I got everything I just listed above for my Powerbook (much better than the default calculator) plus consistency between my phone and computer.
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PCalc