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This is a simple RPN Calculator which can use on iPhone and Apple Watch.*** Important! ***This calculator uses reverse Polish notation for input, and the operation method is different from a normal calculator using infix notation.If you don't know about RPN Calculator, you should not purchase this app.How to use- All devices> Green up-arrow is ENTER button> Stack size can be changed at Setting Screen> Settings button is gear icon in keypad> Can change number format from Settings.- iPhone / iPad> Stack view is scrollable and can show all values in the stack> To delete a value in the stack, swipe left on the value in stack view and tap Delete button.> To delete last typed digit, swipe right on stack view> Swipe action can be modified at Settings Screen> Programs trace key operations registered in Program Settings Screen> Setting button is replaced as other actions button while editing programs- Apple Watch> To show values in stack, swipe down on anywhere on the screen> To back to main screen from stack view, swipe up on the screen> To show scientific operators, swipe up on the screen> To back to main screen from operators screen, swipe down on the screen> Stack view and program view is scrollable with digital crown> To delete last typed digit, swipe right on anywhere at Main screen> Program view shows all programs registered in iPhone. you can't register new program on Apple Watch