# my41CX — HP-41 Microcode Emulator > Accurate HP-41CX calculator emulator with microcode-level NUT processor emulation. (iPhone/iPad app by Miroslav Perovic.) - Source: https://appshunter.io/ios/app/my41cx/id979041950 (this page in markdown: same URL + `.md`) - Developer: [Miroslav Perovic](https://appshunter.io/developer/400748424) - Category: Utilities, Education - Price: Free with in-app purchases - Rating: 5.00/5 from 2 App Store ratings · 53 written reviews indexed - Age rating: 4+ - Requires: iOS 26.0 · 4 MB - Languages: English - Released: 2015-04-01 - Data updated: 2026-08-13 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/my41cx/id979041950/reviews.md ## What is my41CX? The most accurate HP-41CX emulator available. my41cx delivers full microcode-level emulation of the legendary NUT processor, reproducing every behavior of the original hardware with complete fidelity. Built and refined over three major releases, my41cx v3 combines the precision of real hardware emulation with a modern interface designed for daily use. Key Features: - True Microcode Emulation: Not a simulation—an actual NUT processor emulator running original microcode for 100% hardware-accurate behavior. - Modern Interface, Classic Soul: A completely redesigned UI built for today's devices while preserving the authentic feel of the original calculator. - Expandable with ROM Modules: Load external ROM modules to extend the system, just like the real HP-41CX. - Built-in Documentation: Access manuals and reference material directly within the app—no need to search for PDFs. Perfect for engineers, students, scientists, and anyone who appreciates the elegance of HP's finest programmable calculator. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Key features - True microcode emulation - Modern user interface - Expandable with ROM modules - Built-in documentation - 100% hardware-accurate behavior ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Monthly | $0.99 | per month | | Yearly Premium | $9.99 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Unlock Full App | $19.99 | one-time | ## Recent user reviews (10 of 53) All indexed reviews: https://appshunter.io/ios/app/my41cx/id979041950/reviews.md ### 5/5 — An excellent emulation of a classic calculator *2026-03-01* This is a beautifully designed emulation of the HP 41C, 41 CV, and 41CX. The look and feel is just like the real calculator and the functionality is perfect. ### 5/5 — Amazing *2024-10-17, version 2.0.1* The first 'program' I ever wrote was on one of these calculators. As a challenge and over 40 years later I tried to solve Project Euler's 1st problem with this emulator... Done! Brilliant. Works perfectly on my phone. Looks like it will run on my iPad too, although the icon seems to be different. Thanks, Love it ### 5/5 — Best Calculator App Ever *2024-10-09, version 2.0.1* I have used and RPN calculator since college and for years used a 41CX. This calculator is the best version I have found for running on my iPhone. ### 5/5 — i feel this is severely underrated *2024-06-25, version 2.0.1* Great emulation of 41c* calculators, haven’t used it in real life, but came around to love it. ### 2/5 — Buggy *2022-06-08, version 2.0.1* Can't get this to work on my Mac. I have reset the app, but it will not allow me to enter anything via the keyboard, so it makes it sort of useless. ### 4/5 — Good version of the real thing. *2022-03-09, version 2.0.1* Happy the way it works. Only downside is characters on the buttons is rather small. ### 1/5 — HP-41CX *2021-10-04, version 2.0.1* Not functional. Locks up when running a program. ### 5/5 — Fix it *2021-02-27, version 2.0.0* This crashes under IOS 13.2.3 !!!!! Is there a fix please I loved it when it was working Thank you very much for the fix ..... I have it working on IOS14.4 PERFECT !!!! ### 5/5 — Application quits after touching screen. Not working. *2021-02-26, version 2.0.0* A was using it for some time and was ok. For some reason now it closes after launch. Any place on the screen being touched makes the application close for no apparent reason. Otherwise it worked fine for me before. Good for me since then. After updated it started to work fine again. Thank you very much. NOTE: One more thing: The keys letters “V” and “W” are inverted when ALPHA mode is switched on. ### 5/5 — Superb *2021-02-26, version 2.0.0* In February 2021 the app was fixed and it works like a charm again. This was a favorite app until IOS 13 when it quit working. I am thrilled to have it back. The GUI is no longer the accurate visual reproduction of if the original HP layout; however the functionality is back! Today I Snoopy-danced with joy. ## Frequently asked questions about my41CX ### What does the my41CX app do? The my41CX app is a highly accurate emulator of the legendary HP-41CX programmable calculator. It provides full microcode-level emulation of the original NUT processor, ensuring 100% fidelity to the original hardware's behavior. ### What are the key features of my41CX? Key features include true microcode emulation for authentic hardware behavior, a modern interface designed for current devices, the ability to load external ROM modules to extend functionality, and integrated documentation for easy reference. ### Is my41CX free to use? The application is free to download and use. However, it offers in-app purchases, which may be used to unlock additional features or content, as indicated by the 'free with in-app purchases' monetization model. ### Who is the target audience for my41CX? This app is designed for professionals such as engineers, students, and scientists, as well as hobbyists and anyone who has an appreciation for the sophisticated design and functionality of the original HP-41CX calculator. ### Can I expand the functionality of the emulator? Yes, the emulator supports the expansion of its functionality through ROM modules, mirroring the capabilities of the original HP-41CX hardware. This allows users to load external ROMs to access additional features and programs. ## Version history (last 5 releases) ### 3.0.5 — 2026-06-27 All documentation is now free to read! • Every HP-41 manual and reference is now open to everyone — no subscription needed to read them. • Free users can keep 2 documents downloaded at a time. Upgrade to Premium for an unlimited offline library. • Subscription handling improvements and minor fixes. Thanks for using my41CX! ### 3.0.3 — 2026-04-29 Bug fixes: • Fixed Time module stopwatch — stopwatch now starts, runs, and stops correctly • Fixed timer interrupt handling that could cause the calculator to lock up • Improved reliability of clock and alarm functions Thanks to everyone who reported the issue! ### 3.0.2 — 2026-02-26 - Fixed Haptic Feedback: Resolved an issue where haptic vibration and sound feedback were not triggering on some devices. - General Improvements: Minor bug fixes and stability enhancements for a better emulation experience. ### 3.0.1 — 2026-02-18 Fixed a display issue where button labels appeared truncated or oversized on devices with large text accessibility settings enabled ### 3.0.0 — 2026-02-11 my41cx 3.0 is a major update: - Completely Redesigned Interface: The UI has been rebuilt from the ground up—cleaner, faster, and more intuitive while staying true to the original aesthetic. - Integrated Library: Manuals and documentation are now accessible directly within the app. - Under the Hood: Numerous improvements to emulation stability and performance. ## Apps similar to my41CX | App | Rating | Price | Category | | --- | --- | --- | --- | | [RLM-10CX](https://appshunter.io/ios/app/rlm-10cx/id6466089794) | 5.0 (1) | Free | Utilities | | [HP-35](https://appshunter.io/ios/app/hp-35/id6738010641) | 5.0 (5) | Free | Utilities | | [RLM-11CX](https://appshunter.io/ios/app/rlm-11cx/id1630739014) | 3.1 (7) | Free | Utilities | | [Plus42](https://appshunter.io/ios/app/plus42/id1597963622) | 4.9 (79) | $9.99 | Utilities | | [RCL-57](https://appshunter.io/ios/app/rcl-57/id1621959742) | — | Free | Utilities | | [HP15C: Scientific Calculator](https://appshunter.io/ios/app/hp15c-scientific-calculator/id6741306693) | 2.7 (3) | $4.99 | Utilities | ## More apps by Miroslav Perovic - [my59](https://appshunter.io/ios/app/my59/id6759532452) - [my16c](https://appshunter.io/ios/app/my16c/id6762121583) - [my11c](https://appshunter.io/ios/app/my11c/id6762810891) - [Hole in the Floor](https://appshunter.io/ios/app/hole-in-the-floor/id6767888842) All apps by Miroslav Perovic: https://appshunter.io/developer/400748424 ## Related topics [mirocode](https://appshunter.io/ios/topics/mirocode) · [hp calculator](https://appshunter.io/ios/topics/hp-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 2026-08-13.*