RPN Calculator

RPN Calculator (or RPN Scientific Calculator) was a utility for iOS developed by Purgatory Design. Its functionality was inspired by traditional HP calculators which utilized (RPN). It was discontinued some time after December 2021.
==Display formats==
*Standard
*Scientific
*Engineering
==Version history==
*1.0 — January 26, 2009, requires iPhone OS 2.2.
*1.1 — January 7, 2015, supports iOS 8.
*1.1.1 — January 22, 2015
*1.2 — December 21, 2015
*1.3 — January 12, 2016, requires iOS 8.1.
:This app can also be run on Apple M1-based Macs.
==External links==
*RPN Calculator at Purgatory Design (archived 2020-10-30, 2009-04-21)
*RPN Scientific Calculator at the Apple App Store
**RPN Scientific Calculator at the iTunes Store (archived 2012-07-17, 2011-05-15)
*RPN Scientific Calculator at AppAdvice
Category:Purgatory Design products
Category:Discontinued utilities
Category:iOS apps
Category:2009 introductions