# HP41CV > HP-41 CV calculator emulator for iPhone and iPad with UPN. (iPhone/iPad app by Jurgen Anton Strohmer.) - Source: https://appshunter.io/ios/app/hp41cv/id1214637000 (this page in markdown: same URL + `.md`) - Developer: [Jurgen Anton Strohmer](https://appshunter.io/developer/1214636999) - Category: Utilities, Productivity - Price: Free - Rating: 2.70/5 from 21 App Store ratings · 17 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 8 MB - Released: 2017-04-12 - Data updated: 2026-07-21 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/hp41cv/id1214637000/reviews.md ## What is HP41CV? The HP-41 CV for your iPhone! The HP-41 CV was the best and handiest Pocket Calculator in the 90íst. (Part of the Apollo missions!) A UPN calculation with the same genial handling is now available for your iPhone. For all users, not familiar with the UPN Concept, a Basic course with examples is included. The most functions of the HP 41 CV are available free. In addition statistic functions, programmability, persistent Key assignment and new functions like printing will be available as option. ## Key features - HP-41 CV calculator emulation - UPN (Reverse Polish Notation) calculation - Basic UPN course with examples - Core functions available for free - Optional advanced features ## Recent user reviews (10 of 17) All indexed reviews: https://appshunter.io/ios/app/hp41cv/id1214637000/reviews.md ### 3/5 — Multiplication *2025-05-04* 50 x .5 = 0, but 50 x 0.5 = 25.. at least in my experience.. so there may be a workaround for others having similar issues ### 3/5 — ENG mode work wrong *2024-08-09* The ENG mode doesn’t seem to work like my physical HP-41cv calculator. The point of engineering notation is to work mostly with whole numbers. This app seems to convert everything to a decimal when an ENG mode. For example, 123 shows up as “0.123 03” rather than “123.000 00” and 16,000,000 shows up as “0.0160 09” rather than “16.0000 06”. Maybe there’s a setting for this, but I can’t find it so this app isn’t useful to me. ### 1/5 — Not working *2023-10-11* Can’t get this app to do anything ### 2/5 — Functional issues *2023-09-26* Entered 17.3, 0.92 X and got zero. Repeated calculation and sometimes it displays the correct value but if I immediately repeat the calculation, each time thereafter I get a different result and value is decreasing. Stack problem? GUI looks good but math functions need to produce the right values ### 3/5 — Leading Zero *2023-07-10* I am seeing the same issue. If you multiply 50 by .5 you get zero. If you multiply 50 by 0.5 you get 25. Seems like a new issue. Otherwise I really like this app. Used a 41C since the 80’s. Can’t use anything but RPN. ### 3/5 — 41cv *2023-07-09* This app no longer works on my phone. I tried deleting it and reinstalling it and it still does not work. Not all the keys are showing. It’s like it’s zoomed in on the upper right side of the calculator. ### 4/5 — Bug in current version *2023-06-23* I am seeing the same issue. Numbers between 0 & 1 yield inconsistent behavior. 100 Enter .2 X 0.000 Vs 100 Enter 0.2 X 20.000 ### 2/5 — Unreliable *2023-05-28* I’ve been using this app for years and really loved it for the familiarity of RPN and the fact that it works fairly like my HP41CV. I opened it yesterday to do a simple percentage calculation (40 * .25) and I get zero. It repeatedly returns zero. I guess this is the end of this great free app. ### 2/5 — Stuck in scientific notation *2023-05-20* Why did the latest upgrade stick my calculator in scientific notation? No idea how to switch back and no instructions provided. ### 1/5 — Bug *2023-05-17* There is a bug with the decimal key. Please fix!!!! ## Frequently asked questions about HP41CV ### What is HP41CV? HP41CV is a mobile application that emulates the functionality of the classic HP-41 CV pocket calculator from the 1990s. It provides UPN calculation and includes a basic course for users unfamiliar with the concept. ### Is HP41CV free to use? Yes, HP41CV is free to download and use. Many of its core functions are available without charge. Advanced features like statistic functions, programmability, and printing are offered as optional in-app purchases. ### Does HP41CV have ads? No, HP41CV does not contain advertisements. The app is free to download and use, with optional features available for purchase. ### What devices does HP41CV support? HP41CV is compatible with iPhone, iPad, and iPod touch devices. It is designed to run on Apple's iOS operating system. ### How often is HP41CV updated? The latest version of HP41CV is 5.0, and it was last updated on April 3, 2023. This indicates that the app receives periodic updates to maintain compatibility and potentially add new features. ### What is the age rating for HP41CV? HP41CV has an age rating of 4+. This suggests that the content of the application is considered suitable for children aged four and above. ### What is UPN in HP41CV? UPN stands for Reverse Polish Notation, a calculation method where operators follow operands. HP41CV offers this genial handling, and a basic course with examples is included for users new to the UPN concept. ### What are the optional features in HP41CV? Optional features available for purchase in HP41CV include statistic functions, programmability, persistent key assignment, and new functions like printing. These enhance the calculator's capabilities beyond the free core functions. ## Version history (last 2 releases) ### 5.0 — 2023-04-03 Support of Binary values show printing and send to printer ### 4.0.2 — 2017-04-12 This app has been updated by Apple to display the Apple Watch app icon. ## Apps similar to HP41CV | App | Rating | Price | Category | | --- | --- | --- | --- | | [Calculator HD (for iPad)](https://appshunter.io/ios/app/calculator-hd-for-ipad/id760018895) | 4.7 (26) | $1.99 | Utilities | | [my41CX](https://appshunter.io/ios/app/my41cx/id979041950) | 5.0 (2) | Free | Utilities | | [The Best Calculator - Calc Pro](https://appshunter.io/ios/app/the-best-calculator-calc-pro/id451544502) | 4.6 (4,638) | Free | Utilities | | [GraphCalcPro2Go](https://appshunter.io/ios/app/graphcalcpro2go/id1091870099) | 4.6 (40) | Free | Utilities | | [RePNCalc - RPN Calculator Pro](https://appshunter.io/ios/app/repncalc-rpn-calculator-pro/id969780852) | 5.0 (1) | Free | Utilities | | [Paper Calc Office Lite](https://appshunter.io/ios/app/paper-calc-office-lite/id347713516) | 3.8 (44) | Free | Utilities | ## More apps by Jurgen Anton Strohmer - [Jues15Puzzle](https://appshunter.io/ios/app/jues15puzzle/id1502629087) - [JuesTowerOfHanoi](https://appshunter.io/ios/app/juestowerofhanoi/id6457365048) - [SeemannsGlossar](https://appshunter.io/ios/app/seemannsglossar/id6759224897) All apps by Jurgen Anton Strohmer: https://appshunter.io/developer/1214636999 ## Related topics [hp 48 calculator](https://appshunter.io/ios/topics/hp-48-calculator) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-21.*