RPN Calc is made and published by James Mattis. AppBrain is an independent app data site and isn't affiliated with James Mattis. The app name, icon, screenshots and description belong to James Mattis and are shown as published on the App Store.
AppBrain's verdict
Established- Rating on App Store
- 4.00
- 6 ratings
- Last updated
- August 13, 2026
- Size
- 2.70 MB
It doesn't have enough ratings yet to judge what users think.
User feedback
Ratings and reviews on the App StoreComments on RPN Calc for iOS
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Store listing
By James Mattis, from the App Store
Description by James Mattis Written by the developer, not by AppBrain. Click to read.
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.
Safety and technology
Found in the app by AppBrain- Price
- $0.99
- App size
- 2.70 MB
- Content rating
- Everyone
Technologies used by RPN Calc
Releases
Updates seen on the App Store- Version
- 13.1.0
- Launched
- January 2019
No changelog data
Alternatives
Similar apps and more from James MattisAlternatives to RPN Calc
Rankings
App Store top chartsApp Store Rankings for RPN Calc
About the app and developer
About RPN Calc
RPN Calc is an utilities app developed by James Mattis.
User Ratings
RPN Calc is rated 4.00 out of 5 stars. The rating is based on 6 ratings.
App Information
RPN Calc costs $0.99. The app size is 2.70 MB. The latest version available is 13.1.0. The last update was on August 13, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on the App Store since January 2019.
Developer information for James Mattis
Address:
Frequently asked questions about RPN Calc
Is RPN Calc free?
No. RPN Calc costs $0.99 on the App Store.
Is RPN Calc still available?
Yes. RPN Calc is on the App Store, and the last update we saw was on August 13, 2026.
How large is RPN Calc?
RPN Calc is 2.70 MB.
Is RPN Calc suitable for children?
App Store rates the content of RPN Calc as suitable for everyone.
How do people rate RPN Calc?
RPN Calc scores 4.00 out of 5 stars, from 6 ratings on the App Store.
Who made RPN Calc?
RPN Calc was developed by James Mattis. It is listed in the utilities category on the App Store.
What are the best alternatives to RPN Calc?
People looking at RPN Calc also look at these utilities apps: RPN Anywhere, RPN-67 SD, RPN Anywhere Lite, Epic Charging, RCL-57.