iPhone Screenshots


To promo this powerful tool, free in limited time! - 9/10/2017

Remember those days with fantastic HP RPN calculators? Can’t stand the slow speed of those HP RPN simulators on your iPhone devices? Try this one, Stack Calculator - A new type intuitive, rapid of RPN calculator improved from HP calculator.

- equip a real and deep 256 elements data stack, not just 4 registers compared with your old HP calculator. That fully releases your freedom for the data storage and calculation.

- provide stack operation commands such as: Swap, Pick, Roll, Drop. You can freely move and duplicate any top 10 numbers on the stack.

- Speedy, simple and convenient design. short App boot time, well design for number editing, even push into stack.

- multi lines of stack field (about 10 lines) to help you fully monitor and manipulate the data in stack instead of that one line display on your old HP calculator.

- New, elegant and modern graphic interface inherited from iOS.

- unique ‘continuous operation mode’ followed from modern calculator. you can treat your calculator as a counter to count everything.

- 3 flexible number notation format displays: fix points, science notation, engineer notation.

For those not so familiar with HP RPN calculator,
Stack Calculator is a type of RPN (Reverse Polish Notation) calculator based on a 256 depth float-point number stack. A number stack equipped in a calculator is actually a more nature and much efficient way to manipulate number-crunching job and interface between machine and human. This calculator is designed as this concept.

if you saw strange underline text on buttons, this effect is from iOS system, not from this App. Please go to Settings > General > Accessibility and turn off Button Shapes to eliminate underlined texts.

What's New

Version 1.0.1

- UI buttons size/position fine tune on iPhone 6/7, 6/7 Plus, to improve the user experience.
- Some minor bugs fix.


Ming-Chun LIN
22.7 MB
Requires iOS 10.3 or later. Compatible with iPhone, iPad, and iPod touch.
English, Simplified Chinese, Traditional Chinese
Age Rating
Rated 4+
© Ming-Chun Lin


  • Family Sharing

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

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