Stacky

Stacky is a convenient, easy-to-use pocket calculator. The great advantage of Stacky is that it lets you organize numbers in a stack, and all mathematical operations are performed on the numbers at the bottom of the stack.
Stacky offers many helpful features including the following:

Swipe once on the numeric keypad to reveal many mathematical functions!

Swipe to reveal more functions

Enter two numbers together by putting a space between them!

Enter two numbers

Copy a number by touching it!

Copy by touching it

Negate a number by swiping over it!

Negate a number

Erase the stack by shaking your device!

Erase by shaking

Choose a different theme from the theme picker menu!

Choose your theme