Comparison

i41CX+ vs RPN

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

i41CX+

This advanced RPN scientific calculator offers workstation-class Computer Algebra System (CAS) capabilities, going beyond traditional replicas. It provides access to an extensive library of modules and programs, enhanced with iOS features, customizable skins, and iCloud support for seamless data management.

Highlights
  • RPN logic with 4-element stack
  • Extensive memory registers
  • Over 400 built-in functions
  • Computer Algebra System (CAS)
  • Virtual thermal printer/plotter
  • Access to HP-41 module library
  • Customizable skins and keyboard overlays
Features
Read full description

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.

About

RPN

This app is a photo-realistic simulation of a classic scientific calculator, offering advanced programming capabilities beyond the original model. It includes a comprehensive set of mathematical functions and features for easy program management and sharing.

Highlights
  • Photo-realistic calculator simulation
  • Fully programmable with 99 steps
  • Extensive scientific and statistical functions
  • Program library and sharing options
  • Import and export programs
  • 44 pre-installed programs
Features
Read full description

RPN-32 CE is the first photo-realistic simulation of Hewlett-Packard's popular mid-range scientific calculator HP-32E for the iPhone. Produced from 1978 through 1983, it was the "Thyme" member of the third-generation HP calculators known as the "Spice" series. While the simulator works like the original calculator, a number of carefully designed extensions make it a lot easier to use. Unlike the HP-32E, this version is fully programmable, running virtually all programs written for the HP-25! Features: • Photo-realistic look-and-feel • Programmable (99 steps), subroutines, flags, loop control, branching • Insert and delete steps with automatic address correction • 20 registers, "continuous", with unrestricted store/recall arithmetic • Indirect register addressing • "Live" register view • Program listing view • Program library view • Store and retrieve any number of programs • Sharing: e-mail, AirDrop, Dropbox, copy, paste, print • 44 programs pre-installed • Import GO-25 programs • Export programs to RPN-25 CE Calculator functions: • Statistics (mean, standard deviation, linear regression, normal distribution) • Factorial • Trigonometric functions (degrees, radians, grads) • Polar/rectangular conversions • Hyperbolics • Inverse, square root, logarithm, exponential, pi • Storage arithmetic (store and recall) • Percent change • Percentage of Total • Unit and hours conversions • Many additional functions not found on the HP-32 Details: cuveesoft.ch/rpn32

Screenshots

i41CX+4 screens
RPN4 screens

Verdict

The call

The clearest difference is price: RPN at $1.99 against i41CX+'s $24.99. RPN also leads on rating (5.0 vs 4.8) and review sentiment (100% vs 91%). i41CX+'s advantage is update cadence (weekly vs every 3 months) and ratings volume (107 vs 9). On ads, in-app purchases, monetization model and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

i41CX+ costs $24.99 and RPN $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

RPN holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: i41CX+ has 107 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 91% of i41CX+'s written reviews are positive against 100% of RPN's.

UpkeepUpdate frequency

i41CX+ ships an update weekly, RPN every 3 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

Scorecard6 real differences · 4 level
i41CX+ versus RPN: the parameters behind the verdict, then further details
Parameteri41CX+RPN
Price$24.99$1.99 — better
Rating4.8 (107 ratings)5.0 (9 ratings) — better
Positive reviews91.4% of reviews100.0% of reviews — better
Number of ratings107 — better9
Update frequencyWeekly — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.012.0 — better
Further details — not scored
Size124 MB14 MB
Age rating4+4+
DeveloperAntonio LaganaCuVee Software

Customer experience

i41CX+

All ratings107 ratings
Positive94.4%
Neutral0.9%
Negative4.7%
Written reviews266 reviews
Positive91.4%
Neutral3.0%
Negative5.6%

RPN

All ratings9 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

i41CX+

Reported bugs

2 issues
  • Issues with the 41Z math module producing garbled output
  • Scaling problems with overlays

Requested features

4 requests
  • Landscape mode for better button size
  • Haptic feedback for button presses
  • Ability to load and save programs/modules via cloud/email
  • Macros or scripting support

RPN

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

i41CX+

No in-app purchases

None

RPN

No in-app purchases

Questions

Is i41CX+ free?
i41CX+ costs $24.99, with no in-app purchases.
Is RPN free?
RPN costs $1.99, with no in-app purchases.
Which has better reviews, i41CX+ or RPN?
RPN is rated higher. i41CX+ averages 4.8 out of 5 from 107 ratings, while RPN averages 5.0 from 9 ratings.
Do i41CX+ or RPN have ads?
Neither i41CX+ nor RPN shows ads.
Which is updated more often, i41CX+ or RPN?
i41CX+ ships an update weekly, and RPN every 3 months. Most recently, i41CX+ was updated on October 29, 2026 and RPN on October 24, 2026.

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