13.0.5 Safe to install
This application offers a straightforward reverse Polish notation (RPN) calculator, inspired by the classic HP-32SII model and compatible across iPhone, iPad, and Apple Watch platforms.
For users accustomed to HP RPN calculators, the operation of this app should be familiar and intuitive, although it has been simplified for broader usability. It does not support programming features, binary, or hexadecimal calculations.
The interface emphasizes clarity and ease of use, with large buttons designed for quick input. It provides all essential functions necessary for rapid calculations when a mobile device is more accessible than a traditional calculator or computer.
Reflecting on vintage calculator watches from the 1980s—though none featured RPN—the app introduces an RPN calculator directly to the Apple Watch, offering a nostalgic yet practical tool for quick computations on your wrist.
Beyond the main calculator applications available on iPhone, iPad, and Apple Watch, RPN Calc also includes a compact Today Extension. This feature facilitates convenient access to quick calculations directly from the pull-down Today screen of your device.
Overview
RPN Calc is a Commercial software in the category System Utilities developed by James Mattis.
The latest version of RPN Calc is 13.0.5, released on 06/08/2025. It was initially added to our database on 06/08/2025.
RPN Calc runs on the following operating systems: iOS.
Users of RPN Calc gave it a rating of 4 out of 5 stars.
Pros
- Simple and straightforward RPN (Reverse Polish Notation) calculator interface.
- Useful for users familiar with RPN for quick calculations without parentheses.
- Lightweight and easy to use.
Cons
- Limited features compared to more advanced calculators.
- Lack of support for complex calculations such as scientific functions.
- May not be suitable for users unfamiliar with RPN notation.
- Potentially outdated user interface or design.
Screenshots (Click to view larger)
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