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It's an untraditional calculator, but I love Soulver from Acqualia. It is always one of the first things I install on a new iPhone or Mac.

https://www.acqualia.com/soulver/iphone/

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Alternatively, I use a lot for a long while Tydlig. Sadly it has been stagnant for a while (I'd like to be able to save "sheets", for instance). But its interaction mode (akin to a spreadsheet, in a sense) is very refreshing.

http://tydligapp.com

+1 for tydlig, among the first apps I install on every new iPhone

Soulver is amazing, and totally changes the way you use a calculator.

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