This is a simple RPN Calculator which can use on iPhone and Apple Watch.

Watch App has same functions with iPhone App.

How to use
- To push the value you typed, tap green up-arrow button placed on bottom-right
- To delete last typed digit, swipe right on anywhere in screen
- On Apple Watch, all values in stack is shown when you swipe down on the screen
- On Apple Watch, the number of values in stack is shown at top-left of the screen