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 allows you to easily deal with multiple numbers at the same time, which is often hard to achieve with other calculators!

Stacky offers many helpful features including the following:
- All important mathematical functions are readily accessible by swiping once on the numeric keypad.
- Two numbers can be entered together by putting a space between them for quick computations.
- Any number on the stack can be copied by simply touching it.
- Swiping over a number negates it.
- The entire stack can be erased by shaking the device.
- Any operation can be undone at the touch of a button.

Moreover, there is a variety of themes to choose from according to your personal preference.
Last but not least, Stacky works on all your iOS devices!

What’s New

Version 2.4

- Optimized for iOS 13.
- Various bug fixes and improvements.

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

My T myt ,

Great RPN Calculator

This is a great RPN calculator. Made all he better by the latest update that allows it to work in portrait mode on an iPad. All the features you want, and then some. There is a nifty feature that lets you put a "space" between the x and y entries so that all you have to do is press the function key you want to use and voila, the result. Very convenient. I'm also impressed with their responsiveness to customer input. Highly recommended.


Thomas Locher
15 MB

Requires iOS 8.1 or later. Compatible with iPhone, iPad, and iPod touch.


English, French, German, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish, Traditional Chinese

Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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