Crimson Calculator 41cx 4+

RPN Emulator

Crimson Research, Inc.

Designed for iPad

    • 5.0 • 3 Ratings
    • $4.99



The Calc41Cx is a programmable, continuous memory RPN calculator with the following features:

Access to the stack and LASTx via STO and RCL commands.
200-2000 Lines of program memory.
Label addressing with strings
30 user and 26 system Flags.
Conditional and unconditional branching
Convenient insertion and deletion of program steps.
Indirect addressing via any register using the IND modifier.
ISG and DSE looping.
6 levels of subroutines.
Alphanumeric display, storage, and programming.

What’s New

Version 2.0.8

Updated to latest devices

Ratings and Reviews

5.0 out of 5
3 Ratings

3 Ratings

Digitalfix ,

Thank you for making this awesome cx, it works great.

I lived on a 41cx through college and this is a great replica.

efangue ,


Great app! Can the calculator go landscape of portrait?

Let's Be Objective ,

Good first attemp

I am all for lower cost software and the developers are to be applauded for releasing this reasonable emulation of the 41CX at a very reasonable price.

And this release is quite useful if you want to see if you "like" having a 41CX on your iPhone.

Unfortunately if you are serious about using all of the functionality of the 41CX, the current release of this app fails.

At least in my configuration (iPhone 4/iOS 4.3.5) some functions do not execute. E.g., Beep, Tone n, Clock., XYZALM. And Seekpta causes some major memory shifts resulting in a loss of calculator programmed functions.

I have alerted the developers and hopefully they will address these deficiencies.

App Privacy

The developer, Crimson Research, Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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