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

Version 7.4.9

iOS 11 compatibility fix.

Ratings and Reviews

4.0 out of 5
2 Ratings
2 Ratings
Tomcat 14 ,

IT Consultant

The HP-41, when it began it's career, some thirty years ago, was a quantum leap in computer engineering. It is one of the best scientific calculator ever made. The only problem is that the HP-41 is not produced anymore.
But this was before AL Software has developped this wonderful emulator. It is as close as you can get from the real thing.

If you need a scientific calculator, BUY this program. It is an absolute MUST HAVE. Even if you have to buy an iPod Touch just to run it, it still worth the deal…

Phil_ROCKS! ,


My first calculator I bought was the HP41CV, and it stopped working a couple years ago. I grew up with RPN and that's how I think. Researching the history of the HP41 series for my 13yr old son, found this app! Wow! I can have my CV back... And even upgrade to the CX! Regrettably, I cannot migrate my programs, nor plug in my expansion packs, but it's fantastic to see the old familiar keyboard on my iPhone!

TGDavidson ,

New update not working

Last update does not show numbers on screen. Please fix. Once fixed this is a 5 star product I use daily. Thanks


Antonio Lagana
138.1 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad and iPod touch.



Age Rating
Rated 4+
© 2008-2017 AL Software
In-App Purchases
  1. i41CX+ Features Upgrade $24.99
  2. Overlays Upgrade $3.99
  3. Printer Upgrade $5.49


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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