--- title: "i41CX - Reviews, Revenue and Downloads in United States | Apple App Store" description: "i41CX is the same powerful advanced programmable RPN scientific calculator as the highly acclaimed i41CX+ but without the latter’s incredibly advanced capabilities such as the printer, expansion, CAS," --- # i41CX — United States > RPN Calc ![i41CX App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/6a/75/fe/6a75fe1f-62af-6159-45d9-8d95a90af40e/AppIcon-i41CX-0-0-1x_U007emarketing-0-8-0-85-220.png/434x0w.png) **Developer:** [Antonio Lagana](https://apptail.io/developer/antonio-lagana-uoG) **Category:** Productivity **Rating:** 4.6/5 (45 ratings) **Price:** $7.99 **Bundle ID:** com.alsoftware.i41CX **Store:** Apple App Store **Country:** United States **Version:** 7.6.24 (released 2026-09-27) **Original Release:** 2008-10-16 **Languages:** English **App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id292619450) **AppTail Page:** [https://apptail.io/app/i41cx-tOLc/united-states](https://apptail.io/app/i41cx-tOLc/united-states) ## i41CX Description i41CX is the same powerful advanced programmable RPN scientific calculator as the highly acclaimed i41CX+ but without the latter’s incredibly advanced capabilities such as the printer, expansion, CAS, etc. It is functionally equivalent to the world-renowned HP-41CX and inherits all of the i41CX+ usability features including extremely responsive and animated key clicks, audible key feedback sounds, optimally spaced keys for accurate input, traditional and upbeat modern diverse set of skins, etc. If you are looking for a powerful programmable RPN scientific calculator but don’t need all of the capabilities of i41CX+ then i41CX is for you. And best of all, if you ever decide that you need the more advanced capabilities of i41CX+ you can enable them using secure in-app purchases right within the app! FEATURES: • RPN logic with a 4 element deep memory stack • 319 main and 124 extended memory registers • Over 300 built-in functions, including nearly 100 functions created specifically for i41CX • Time, calendar, alarm, and stopwatch functions • Rich set of functions and algorithms: numerical, mathematical, statistical, and much more • Access to the entire HP-41 library of solutions for science, mathematics, statistics, engineering, business, financial, surveying, medicine, real estate, and many other domains • Programmable - Over 2000 lines • User definable keyboard • Ability to operate the calculator using a Bluetooth keyboard • Device integration: external display mirroring, copy and paste, GPS, accelerometer, digital compass, time and date synchronization, and much more • iOS 8 Notification Center widget • Sound support including synthetic tones and interface sounds • Support for calculator skins and optional mini stack display • Adjustable sound volume and display colors • Usage & Examples table with usage tips and examples • Quick reference guide of all built-in functions • Beautiful and clean user interface *********************************************************** A comprehensive FAQ is available at Please don't hesitate to use the "Contact Us" link there if you cannot find the answers or information that you seek. Thank you. ## i41CX Screenshots - [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/Purple113/v4/8d/4a/93/8d4a933d-6a8c-c576-ddf7-0b9bedce5b70/mzl.cvulejfq.png/640x960.png) - [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/Purple123/v4/de/c9/6a/dec96aff-01a2-22ae-4a56-bfe2e147e1a3/mzl.mylugjay.png/640x960.png) - [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/Purple123/v4/59/52/15/59521517-b054-433f-caaf-4c5e14bfda6d/mzl.raslfpvn.png/640x960.png) - [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/Purple113/v4/38/7b/8e/387b8ecf-3ac1-42d4-c30a-172c35b52c6d/mzl.ipevsfle.png/640x960.png) - [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/Purple123/v4/2c/d3/09/2cd309e2-6219-78ed-4859-09efdf24f55f/mzl.ofnteryn.png/640x960.png) ## i41CX Rating Breakdown in United States - 5 stars: 38 (84%) - 4 stars: 3 (7%) - 3 stars: 1 (2%) - 2 stars: 1 (2%) - 1 stars: 2 (4%) ## i41CX Reviews in United States ### ***** "So good I retired my HP-41CV!" This is a great program! The interface is so well designed and uses all of the available screen space so that the numbers are readable for this old timer. In the HP tradition, this app exceeds expectations in both quality and performance. -- nickname 314159-2653590, 2024-06-14 ### ***** "Masterful reincarnation of the original !" Well done! $/feature/functionality it’s like buying a hand held super computer. Holy cow! Not to mention throw-back value for boomer generation :) -- BLouChip Consulting, 2022-10-02 ### ***** "This is a great app!" I have been using HP calculators since I bought a HP45 in about 1973 With HP mostly out of the Scientific RPN calculator area this app fills the need! Makes me miss my HP41CV I had (that died after many years of heavy use). Super customer service as well. -- W8WCA, 2022-01-26 ### ****- "Latest Update Caused Problems - Now Fixed!" UPDATE - The display issue from v7.6.1 is fixed - via 7.6.2. The calc is now back to the great tool that it has been for quite a while and I look forward to continuing to use it for another few years. Thanks. PRIOR - The most recent update may have made for compatibility with the latest iOS (I haven't tried it yet on my iPhone and likely won't based on this experience) but it no longer works on my iPad that has an older iOS. The background graphics no longer scale up to the screen size so the touch points for the calc do not agree with the visual indications for the buttons. Avoid this version. Wait until it is fixed if you have an iPad with an older iOS. -- cb_cb1, 2020-10-09 ### ***** "Mazel Tov!" I wore out my HP-41 calculator but it was the thing that brought me back to programming after a nauseating experience with FORTRAN 77 in 1981. I wrote nearly 200 programs on that calculator. It got me through engineering school, taking the PE, working on the Hubble, B2, and 7x7s. I’m glad to have it back, even just as a calculator. I’m curious: Can I still write a subroutine to cause the calculator to automatically shut down when I turn it on using flag 11? -- Weyland-Yutani, 2020-01-23 ### ***** "The REAL thing..." Latest speed enhancement is phenomenal! Thank you. Now if we can have it always “ON” when it comes up, then it would be perfect! Is there a setting that would have turn on automatically when it starts? -- First Review My Files Free, 2019-09-12 ### ***** "LOVE IT and no buying N size batteries" Love it love the way the case looks 35 years using one now have it on me -- Big Screen us BA, 2018-12-29 ### ***** "The Best RPN Calculator." For all the reasons HP RPN scientific calculators are used for engineering, this calculator is simply the best. All the features of the best HP calculators, with improvements. Outstanding. -- DRGWMaine, 2018-10-23 ### ***** "Love it!" I LOVE the way it reproduces the look as well as the action of the calculator. It just wouldn’t be the same without emulating the case, the ports everything. That is for this final but critical extra touch. -- Nick D. Name, 2018-06-03 ### ***** "Awesome!" I used an HP-41c for years in engineering. This now is far more convenient and true to the original. Developer is also very responsive. -- Mennonite Guy, 2018-04-18 ### *---- "No longer works" This app no longer works. It needs to be updated. Too bad because this was my favorite calculator. -- Gunnerbeast, 2018-01-19 ### ***** "Yeah !! Haptic feedback" Great calculator that is now perfect with haptic feedback. Been waiting on this for years. Now much easier to ensure you hit the right keys -- Jeffcincy, 2017-04-28 ### ***** "Fantastic" I bought an HP-41 for the first time in 1981. Still have it. It was the best calculator money could buy (and it was expensive!). This app works EXACTLY like my physical HP-41. The attention to detail is incredible. I was thrilled when I found this app and gladly paid for it. -- jerrylanejohns, 2016-09-09 ### ***** "Nice app for die-hard HP calculator people" Having lost my HP 22, 19C, 45 calculators, this app is a perfect app and love it! RPN habits are engraved in my brain and love this app! -- XOXOHPXOXO, 2016-07-30 ### ***** "Magnificent Emulation" With real programmability like the original (now nearly 40-years old), you should have little difficulty transitioning to the iPhone version. Fish out the original manual if you're rusty (it isn't supplied), and yes, you can upgrade in-app for the emulated plug-in packs (nothing to download, as they are already built-in, awaiting payment). -- Aardvark1917, 2016-07-18 ### ***** "Reality nice app." When I'm not at the office where my 41cv is I can have my preferred calculator with me as an app. Nice J O B !! I purchased my 41cv in 1979 and still use it. -- Mrp11, 2015-11-17 ### ***** "If you use a HP RPN calculator, this is for you!" I regularly use a HP calculator for engineering calculations, and once I got used to Reverse Polish, I've found RPN simplifies complex string calculations. This app provides a pretty much flawless emulation of the great HP 41CX. It's great for quick calculations, rectangular/polar conversions, etc. AND - I don't have to carry around a separate device - it's on my phone. If you don't need to graph functions (and most of us rarely do) AND like RPN, this is a great app. -- Doggydog8, 2015-10-25 ### ***** "A Dream Come True" When I purchased an HP-41C in 1980 (?) it was the most advanced calculator on the market. Programmable and using RPN logic, I enjoyed developing programs for science projects. This version duplicates much of the original device and adds advanced capabilities. Though replacing a couple of algebraic based calculators, this i41Cx is my choice along with a graphing computer. -- Invisible Ed, 2015-04-11 ### ***** "Best calculator ever" I grew up with an HP41 CV through 4 years of Physics classes. This calculator is the closest match and does everything that I used to do -- Marmoset Killer, 2015-03-14 ### ***** "This is Great HP41CX (v4.9.2)" I have owned and used HP41CV since early 80's and HP41CX since mid 90's. I still use them daily. Had to scrounge everywhere to keep a working model going. Although I would still prefer the feel of a physical machine, this app is absolutely fantastic and I use it all the time. It has performed flawlessly and is great fun since I now can have the calculator at my side to address, or analyze the world around me. It looks good, it works good and it's a blast to have such access. 3/2015 Update: OMG! After using this IOS version on my iPad Air 2 for awhile, I am beginning to enjoy the IOS version more than my original HP (I own 3) versions. -- EcklarA, 2015-03-11 [View all i41CX reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews) ## i41CX In-App Purchases | Item | Price | |------|-------| | i41CX+ Features Upgrade | $17.99 | | Overlays Upgrade | $2.99 | | Printer Upgrade | $3.99 | | CAS Upgrade | $7.99 | ## i41CX Store Rankings | Chart | Country | Category | Rank | |-------|---------|----------|------| | Top Paid | Belgium | Productivity | #101 | | Top Paid | South Africa | Productivity | #112 | | Top Paid | Switzerland | Productivity | #113 | | Top Paid | Austria | Productivity | #123 | | Top Paid | Ecuador | Productivity | #138 | | Top Paid | France | Productivity | #150 | | Top Paid | Denmark | Productivity | #155 | | Top Paid | New Zealand | Productivity | #162 | | Top Paid | Argentina | Productivity | #163 | | Top Paid | Mexico | Productivity | #165 | | Top Paid | Norway | Productivity | #169 | | Top Paid | Sweden | Productivity | #170 | | Top Paid | Italy | Productivity | #180 | | Top Paid | Netherlands | Productivity | #183 | | Top Paid | United States | Productivity | #185 | | Top Paid | Brazil | Productivity | #192 | | Top Paid | Spain | Productivity | #196 | | Top Paid | Chile | Productivity | #204 | | Top Paid | Colombia | Productivity | #221 | | Top Paid | Finland | Productivity | #223 | | Top Paid | Australia | Productivity | #248 | ## i41CX Discovered Keywords - hp41cv - rpn scientific calculator ## Apps Similar to i41CX - [RPN-65 SD](https://apptail.io/app/rpn-65-sd-JJcb/united-states) - [RPN-34 CE](https://apptail.io/app/rpn-34-ce-ojSb/united-states) - [Vintage-45](https://apptail.io/app/vintage-45-QYlc/united-states) - [RLM-15CX](https://apptail.io/app/rlm-15cx-xPxc/united-states) - [RPN-55 SD](https://apptail.io/app/rpn-55-sd-rfhd/united-states) - [RPN-35 SD](https://apptail.io/app/rpn-35-sd-EAHd/united-states) - [RPN-45 SD](https://apptail.io/app/rpn-45-sd-TAae/united-states) - [RPN-67 NP](https://apptail.io/app/rpn-67-np-qgwl/united-states) - [DB50X](https://apptail.io/app/db50x-IHYq/united-states) - [DB40X](https://apptail.io/app/db40x-bNZq/united-states) ## i41CX Available In - [United States](https://apptail.io/app/i41cx-tOLc/united-states) - [Germany](https://apptail.io/app/i41cx-tOLc/germany) - [Spain](https://apptail.io/app/i41cx-tOLc/spain) - [Mexico](https://apptail.io/app/i41cx-tOLc/mexico) - [France](https://apptail.io/app/i41cx-tOLc/france) - 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