i41CX

i41CX

RPN Calc

43 ratings
125 reviews
#191 in paid Productivity
🔧 Utilities
📊 Productivity
$7.99
In-App Purchases

Details

  • Released
  • Updated
  • October 16, 2008
  • January 28, 2026
i41CX screenshot #1 for iPhone
i41CX screenshot #2 for iPhone
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i41CX screenshot #5 for iPhone
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About

This app offers a powerful RPN scientific calculator experience, functionally equivalent to a renowned model. It provides extensive memory registers, over 300 built-in functions, and programmability. Advanced features can be unlocked via in-app purchases.

RPN logic with 4-element stack
319 main and 124 extended memory registers
Over 300 built-in functions
Programmable up to 2000 lines
User-definable keyboard
Bluetooth keyboard support
Device integration features
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What's New in i41CX

7.6.19

January 28, 2026

• Fixed bug introduced in 7.6.18

4

In-App Purchases

$17.99

i41CX+ Features Upgrade

Upgrade to the i41CX+ feature set. The upgrade provides access to the printer, expansion modules, file I/O, and other features that are available in i41CX+. Once upgraded, your copy of i41CX will have the same feature set as i41CX+.

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Charts

Top Paid

📉 191-24

Productivity

This app dropped -24 positions in Productivity chart.

Last updated on July 24, 2026.

User reviews

Indispensable

Une réplique merveilleuse de la HP41CV

Perfeita

Perfeita, dunciona exatamente como minha antiga HP41C!

Simply the best HP41 emmulator

I've been using my original HP41CV since ~ 1980, and just love RPN and the functionality and the history of this groundbreaking calculator. I use an emmulator on my PC, but was challenged finding a good emmulator while on other mobile platforms. This is the first app I purchased once moving to IPhone in 2017 and I it's the only calculator I use. Works just like the original and always brings me great memories, making me smile every time I use it.
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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.

Genial. Igual que la auténtica.

Para cualquiera que la tenga o la añore. Como llevarla encima.

Developer apps

FAQ

What does this app do?

This app provides a powerful RPN scientific calculator experience, functionally equivalent to the renowned HP-41CX. It offers a deep memory stack, a vast array of built-in functions, and extensive programmability, making it suitable for complex calculations in various scientific and engineering domains.

What are the key features of this calculator app?

Key features include RPN logic with a 4-element stack, 319 main and 124 extended memory registers, over 300 built-in functions, and the ability to program up to 2000 lines. It also supports a user-definable keyboard, Bluetooth keyboard operation, and various device integrations.

How much does this app cost?

The app is free to download and use with its core RPN calculator functionality. However, more advanced capabilities, such as those found in the i41CX+ version, can be unlocked through secure in-app purchases.

What kind of users is this app designed for?

This app is designed for users who require a powerful and programmable RPN scientific calculator. It is particularly useful for students, engineers, scientists, and professionals who need advanced calculation capabilities and appreciate the efficiency of RPN logic.

Can I use this app with a physical keyboard?

Yes, the app supports operating the calculator using a Bluetooth keyboard. This feature enhances usability for users who prefer physical input methods for extensive calculations or programming.