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i41CX+ — RPN Calculator with Printer and CAS

By AL Software

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iOS 3 can’t install from Safari. You can still download the IPA file, but you’re on your own after that.
i41CX+ — RPN Calculator with Printer and CAS
 This app is designed for both iPhone and iPad

RequirementsCompatible with iPhone, iPod touch, and iPad. Requires iOS 2.0 or later.

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i41CX+ is an advanced programmable and expandable RPN scientific calculator with a virtual thermal printer/plotter and workstation-class CAS capabilities that is far beyond a mere replica of the original. In addition to being functionally equivalent to the world-renowned HP-41CX and providing access to its entire library of modules and programs, i41CX+ is enhanced with iOS and hardware features, keyboard overlays, rich set of import and export capabilities, traditional and upbeat diverse set of skins, complete color control, iCloud support, and much more.

The i41CX+ CAS is a full implementation of REDUCE. It's like having Mathematica or the computational engine of Wolfram Alpha in your pocket and, best of all, it runs natively so no internet connection is required. The CAS is fully programmable and provides the ability to reuse previous results in computations. Moreover, the CAS has full access to the calculator registers so it is possible to combine RPN programs with CAS programs.

This is the finest and most powerful scientific/engineering/financial calculator for iOS devices bar none.

CALCULATOR FEATURES: • RPN logic with a 4 element deep memory stack • 319 main and 600 extended memory registers • Over 400 built-in functions, including over 100 functions created specifically for i41CX+ • Time, calendar, alarm, and stopwatch functions • Four module ports provide access to HP-41 expansion pacs • Rich set of functions and algorithms: numerical, mathematical, statistical, complex, matrix, numerical integration, curve fitting, solutions to equations, and much more • Powerful, flexible, and programmable Computer Algebra System (CAS) supporting symbolic, arbitrary precision, scalar, vector and matrix algebra calculations, 2D/3D plotting, and much more • Full-screen text editor with configurable font style and size, color scheme, a user configurable macro keyboard, and a numerical keyboard • 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 - virtually unlimited number of lines • User definable keyboard • Ability to operate the calculator using a Bluetooth keyboard • Device integration: external display mirroring, copy and paste, in-app mail, system keyboard, GPS, accelerometer, digital compass, time and date synchronization, AirPrint, and much more • Virtually unlimited data and program storage capacity using the device's flash memory for local storage • Import/export data, programs, overlays, modules, etc. via the web, email, and iTunes file sharing • iCloud syncing of files and preference settings • iOS 8 Notification Center widget • 43 available keyboard overlays and support for user created overlays • Sound support including synthetic tones and interface sounds • Support for calculator skins and optional mini stack display • Adjustable calculator speed, sound volume, and display colors • Usage & Examples table with usage tips and examples • Quick Reference Guide of all built-in functions • CAS Quick Reference with all built-in functions, operators, switches, and packages • Beautiful and clean user interface

PRINTER FEATURES: • Support for printing, plotting, graphics, and special characters • User configurable and programmable print color • Export printer output via email, clipboard, or AirPrint • Ability to save a JPEG image of the paper roll to the device's photo album

*********************************************************** A comprehensive FAQ and Mini-Manual are available at http://alsoftiphone.com/i41CXplus. Please don't hesitate to use the "Contact Us" link there if you cannot find the answers or information that you seek. Thank you.

Sort by Date
Show everything
To install apps directly onto this device, it must be jailbroken with AppSync installed.
1.2
Requires iOS 2.1+
Non-Retina
October 14, 2008
6.5 MB Install Download
2.1
Requires iOS 2.1+
Non-Retina
May 20, 2009
6.4 MB Install Download
7.0.1 (8)
Requires iOS 5.1.1+
Retina
November 8, 2014
70.6 MB Install Download 1 more copy ›
i41CXp 7.0.1.ipa · 130.2 MB Encrypted Install Download

Bundle Size Over Time

Bundle size over time6.5 MB — October 14, 2008. 6.4 MB — May 20, 2009. 70.6 MB — November 8, 201417.7 MB35.3 MB53.0 MB70.6 MB6.5 MB — October 14, 20086.4 MB — May 20, 200970.6 MB — November 8, 2014Oct 2008Nov 2014

Chart History

Top Paid · Productivity View chart ›
Peaked at #296 (February 26, 2010) · 1 archived capture · Feb 2010

Ratings Over Time

sampled from 6 archived captures
DateVersionRatingRatingsPrice
March 27, 2010 4.0.1 — 235 $29.99
April 12, 2011 4.8 — 318 $24.99
April 10, 2012 — — 357 $24.99
November 27, 2015 7.3.1 — 421 $24.99

From archived App Store listing data, captured by the Wayback Machine.

Archived Reviews

8 of 25
Just like HP used to make!
     
by Ronlap · July 25, 2018

This is one of my most used programs. I grew up with RPN and can’t really use anything else efficiently. Thank you!

Fantastic upgrade - 9/14/2019
     
by BrianP1 · September 14, 2019

So, I’m a consulting biostatistician. I learned RPN several years ago and stuck with it. This is an incredible emulator for an RPN calculator. I have to say I use this app more than any other on my phone. The only negative was it took an insufferable amount of time to load the app. This latest upgrade finally solved this problem. THANK YOU, DEVELOPERS for finally fixing this. A+ app. Can’t say enough good things about it now.

Best and most useful app I have ever purchased!
     
by FleetCmd · April 26, 2024

Amazing! The best calculator in history fully replicated for the iPhone. I bought it when it was first introduced and it has been used daily ever since! The author has kept it current and support is great!

Help
     
by H3A3N5K0 · March 4, 2019

Mr. Lagana, it seems as I have both i41CX &.i41CX+ and when USER is on and I tap no. 4 I get all 000000 on screen, when off 4 is ok. Please investigate. Jacob Paul Gable Thank You

Superb
     
by Bill9876 · April 4, 2020

As a longtime user and fan, I have to applaud the design, implementation and continuing support and maintenance of this app. I cannot work without this RPN calculator.

My all time favorite calculator HP 41Cx
     
by JohnnyAppleseed48 · August 1, 2018

In 1979, I purchased my “41-C”. It was love at first tap. I was a real estate appraiser and moved into IT. I never found there was any calculator activity that I couldn’t do more easily on the 41. I have owned MANY programmables of both HP and TI. I always cherished the 41 most. After owning the Android version of the 41C on the Galaxy S4, when I recently upgraded to an IPhone, I quickly sought to replace the Android version with the IOS version. I saw the other “simpler” and cheaper versions of 41C’s then noticed this version.. Even at $25, this AP IS worth the difference. This version includes simulation of a FULLY loaded HP 41C (ALL HP and other modules, with virtual printer emulation). What’s more.. the author integrated device from the I-device( e.g. accelerometer, GPS, real time clock etc.). Other than not likely permitted on scholastic tests (CLEP, ACT, etc), I would think this would be a great student calculator. Of course I love the RPN logic...

Overlays
     
by Sirniteob1 · February 13, 2021

The overlays do not scale correctly. Overlays are about 75% the size they need to be.

Wow
     
by wozander · October 5, 2019

This guy has kept up w years of iOS updates and continues to improve a great product. I use it more than the phone app. The last improvement on startup time is much appreciated.

Period reviews recovered from Apple's customer-review feeds via the Wayback Machine.