Stack_Calculator app for iPhone and iPad

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

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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.

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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.