# Crimson Calculator 41cx — RPN Emulator > Programmable RPN calculator emulator with advanced features and alphanumeric display. (iPhone/iPad app by Crimson Research, Inc..) - Source: https://appshunter.io/ios/app/crimson-calculator-41cx/id427517928 (this page in markdown: same URL + `.md`) - Developer: [Crimson Research, Inc.](https://appshunter.io/developer/289258792) - Category: Education, Utilities - Price: $4.99 - Rating: 5.00/5 from 3 App Store ratings · 4 written reviews indexed - Age rating: 4+ - Requires: iOS 14.0 · 1 MB - Languages: American English - Released: 2011-04-06 - Data updated: 2026-07-05 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/crimson-calculator-41cx/id427517928/reviews.md ## What is Crimson Calculator 41cx? The Calc41Cx is a programmable, continuous memory RPN calculator with the following features: Access to the stack and LASTx via STO and RCL commands. 200-2000 Lines of program memory. Label addressing with strings 30 user and 26 system Flags. Conditional and unconditional branching Convenient insertion and deletion of program steps. Indirect addressing via any register using the IND modifier. ISG and DSE looping. 6 levels of subroutines. Alphanumeric display, storage, and programming. ## Key features - Programmable RPN calculator emulation - Access to stack and LASTx - 200-2000 Lines of program memory - Label addressing with strings - 30 user and 26 system Flags - Conditional and unconditional branching - Alphanumeric display and programming ## Recent user reviews (4 of 4) All indexed reviews: https://appshunter.io/ios/app/crimson-calculator-41cx/id427517928/reviews.md ### 5/5 — Thank you for making this awesome cx, it works great. *2013-12-09, version 1.2.1* I lived on a 41cx through college and this is a great replica. ### 1/5 — Broken *2012-11-30, version 1.1.2* I just installed this app and was not able to enter any values, and the app was completely unresponsive and nonfunctional. ### 4/5 — HP 41CX *2012-11-10, version 1.1.2* Great app! Can the calculator go landscape of portrait? thanks ### 3/5 — Good first attemp *2011-10-12, version 1.1.0* I am all for lower cost software and the developers are to be applauded for releasing this reasonable emulation of the 41CX at a very reasonable price. And this release is quite useful if you want to see if you "like" having a 41CX on your iPhone. Unfortunately if you are serious about using all of the functionality of the 41CX, the current release of this app fails. At least in my configuration (iPhone 4/iOS 4.3.5) some functions do not execute. E.g., Beep, Tone n, Clock., XYZALM. And Seekpta causes some major memory shifts resulting in a loss of calculator programmed functions. I have alerted the developers and hopefully they will address these deficiencies. ## Frequently asked questions about Crimson Calculator 41cx ### What is the learning methodology of Crimson Calculator 41cx? Crimson Calculator 41cx emulates a Reverse Polish Notation (RPN) calculator, a method that uses a stack for calculations. This approach can be more efficient for complex operations once mastered. ### How does Crimson Calculator 41cx track user progress? As a calculator emulator, Crimson Calculator 41cx does not inherently track user progress in a learning sense. Its focus is on providing a functional tool for calculations and programming. ### Does Crimson Calculator 41cx offer certifications? Crimson Calculator 41cx is a calculator emulation tool and does not offer any certifications. Its purpose is to provide a platform for performing calculations and programming. ### What is the price of Crimson Calculator 41cx? Crimson Calculator 41cx is a paid application, priced at $4.99. ### What devices does Crimson Calculator 41cx support? Crimson Calculator 41cx is supported on iPhone, iPad, and iPod. ### How often is Crimson Calculator 41cx updated? The latest version, 2.1.0, was released on August 7, 2023. Updates typically occur to improve functionality and compatibility. ### What is the age rating for Crimson Calculator 41cx? Crimson Calculator 41cx has an age rating of 4+. ### Does Crimson Calculator 41cx have ads? Crimson Calculator 41cx does not contain advertisements. ## Version history (last 5 releases) ### 2.1.0 — 2023-08-07 Deployment target to 14 and colors ### 2.0.8 — 2020-06-24 Updated to latest devices ### 1.2.1 — 2013-01-09 iPhone 5 Support ### 1.1.2 — 2012-03-18 iPad retina support. ### 1.1.1 — 2012-01-09 Cleaned up some memory leaks. 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User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-05.*