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All Versions of RPN Calc


May 21, 2024

- Interface refreshed and updated with a clean, modern design!


April 18, 2024

- Interface refreshed and updated with a clean, modern design!


April 16, 2024

- Interface refreshed and updated with a clean, modern design!


January 25, 2024

- Interface refreshed and updated with a clean, modern design!


July 26, 2023

- Update for Apple Watch Ultra


January 14, 2022

- Minor bug fix.


October 14, 2021

This app has been updated by Apple to display the Apple Watch app icon. Updated for the new Series 7 Apple Watches!


October 13, 2021

Updated for the new Series 7 Apple Watches!


June 3, 2021

Minor bug fixes


May 25, 2021

Minor bug fixes.

Price History of RPN Calc

Description of RPN Calc

A simple reverse polish notation calculator loosely based on my trusty HP-32SII that runs on iPhone, iPad, and Apple Watch! If you are familiar with HP RPN calculators, the operation of this calculator should seem very straightforward - albeit simplified. It can't be programmed, and it doesn't handle binary, or hexadecimal numbers. But, it has a clean, simple interface with large, easy to press buttons. It has all of the functions required for quick calculations when your iPhone is handier than your computer or calculator. And, remember those cool calculator watches from the 1980s? Unfortunately, none of them were RPN. RPN Calc brings a reverse polish notation watch calculator to the Apple Watch! In addition to the standard RPN Calculator app that runs on iPhone, iPad, and Apple Watch, RPN Calc includes a handy micro RPN Calc Today Extension available for convenient access to quick calculations from the pull down Today screen.
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Is the RPN Calc app compatible with iPads?

Yes, RPN Calc offers an iPad version.
James Mattis is the developer of RPN Calc.
The minimum iOS requirement: 16.0.
RPN Calc has an okay rating of 4.0 out of 5, according to user reviews.
The App Genre Of The Rpn Calc App Is Utilities.
The latest version of RPN Calc is 13.0.3.
The latest RPN Calc app update was released on July 16, 2024.
RPN Calc was first made available on February 6, 2023.
Safe for kids, with no inappropriate or mature content.
RPN Calc is now available to use in English.
Unfortunately, RPN Calc is not on Apple Arcade.
Unfortunately, RPN Calc does not provide opportunities for in-app purchases.
Unfortunately, RPN Calc is not fully compatible with Apple Vision Pro.

Screenshots of RPN Calc


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Reviews of RPN Calc

  • Clean Design... But need one one thing

    Nice layout. Works well but needs one more thing.

    It is very necessary to have an x(exchange)y function on the keyboard.

    Many calculations need this capability to set up for a solution as RPN uses the x-y order for them....

    Please add this to an update if you can.
  • Close to perfect

    I love this for my watch it it could really use square root key
  • Works well on Watch and Widget

    I have always liked RPN calculators more than algebraic. This is a fairly simple RPN calculator that works surprisingly well as a widget but also on the Apple Watch. It has a four level stack. It does have an unusual behavior where if the stack is full and you add up all the numbers the number that was on the top of the stack is repeated ad infinitum in the Y position. If you pay attention to what you're doing this should not cause a problem but I found it odd. I would like to see instructions included as well as sound effects in the widget so that when I press on the key there is a click or tone.