The only one pocket calculator for iPhone, iPad, Apple Watch, Apple TV and also works as Today Widget, Message Extension and Keyboard.
Simple pocket calculator supports parentheses and memory functions.
Also as Today Widget, Message Extension or Keyboard possible - just enable it.
Currency Exchange Calculator available for iPhones and Apple watch.
Please note: The Apple Watch calculator is small. Anyhow all on a single screen and the calculation step is always visible.
In addition you can disable the Function Screen. Then it is a simply calculator. Just go to the Watch Settings.
Select own currency as from currency, select a different currency as to currency, type in exchange rate, long press own currency. Now all exchange rates for the other currencies will be calculated and stored. On Watch just deep press on currency calculator.