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i41CX — RPN Calculator

By AL Software

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*** Optimized for iOS 8 and 64-bit devices! ***

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!

• 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.

What's New in Version 7.1.2

• Minor bug fixes.


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Customer Reviews


This is a wonderful app that both looks and feels like the HP41CX. I ended up getting some in app upgrades, and may have chosen the more expensive i41CX+ had I known the app was this good. It is especially useful to people who have used the HP41 series calculators. Very helpful tech support!

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

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.

i41CX — RPN Calculator
View In iTunes
This app is designed for both iPhone and iPad
  • $7.99
  • Category: Productivity
  • Updated:
  • Version: 7.1.2
  • Size: 156 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 5.1.1 or later. Compatible with iPhone, iPad, and iPod touch. This app is optimized for iPhone 5.

Customer Ratings

We have not received enough ratings to display an average for the current version of this application.
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Top In-App Purchases

  1. i41CX+ Features Upgrade$17.99
  2. Overlays Upgrade$2.99
  3. Printer Upgrade$3.99
  4. CAS Upgrade$7.99