# i41CX+ vs RPN

The clearest difference is price: RPN at $4.99 against i41CX+'s $24.99. i41CX+'s advantage is rating (4.8 vs 4.3) and ratings volume (106 vs 6). On review sentiment, ads, in-app purchases and monetization model there is nothing between them.

i41CX+ costs $24.99 and RPN $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

i41CX+ holds the better App Store score, 4.8 against 4.3. That said, the two scores are not equally well evidenced: i41CX+ has 106 ratings behind it against 6, 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 90% of RPN's.

i41CX+ ships an update every 5 weeks, RPN every 3 months. The most recent releases landed on September 25, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | i41CX+ | RPN |
| --- | --- | --- |
| Price | $24.99 | **$4.99** |
| Rating | **[4.8 (106 ratings)](https://appshunter.io/ios/app/i41cx-plus/id289068865/reviews)** | [4.3 (6 ratings)](https://appshunter.io/ios/app/rpn-67-pro/id603103972/reviews) |
| Number of ratings | **106** | 6 |
| Positive reviews | **91.3% of reviews** | 90.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 3 months |
| Monetization | Paid | Paid |
| Size | 123 MB | 78 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Antonio Lagana](https://appshunter.io/developer/289068868) | [CuVee Software](https://appshunter.io/developer/424873503) |

## What reviewers say

### i41CX+

[App page](https://appshunter.io/ios/app/i41cx-plus/id289068865)

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Fantastic emulation of the original HP41 calculator
- 🔒 Faithful to the original hardware and functionality
- 👍 Includes all the expansion modules and accessories
- 👍 Responsive and never crashes
- 👍 Excellent implementation of RPN and programmability

**What reviewers complain about**

- 🔋 Can drain battery when left on
- 👎 Small button size can lead to mis-taps
- 👎 Slow startup time in some versions

**Reported bugs**

- Issues with the 41Z math module producing garbled output
- Scaling problems with overlays

**Requested features**

- 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

[App page](https://appshunter.io/ios/app/rpn-67-pro/id603103972)

This app is a faithful simulation of a legendary 1970s programmable calculator, offering advanced features for scientists and engineers. It allows users to run existing programs, manage virtual program cards, and even print listings, all on their iPad.

**Highlights:** Virtual program and data cards, Virtual paper tape printer, Database-driven card manager, Save card collections to Mac/PC, Formatted program listings, Print listings via AirPrint, Live display of stack and registers

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is i41CX+ free?

i41CX+ costs $24.99, with no in-app purchases.

### Is RPN free?

RPN costs $4.99, with no in-app purchases.

### Which has better reviews, i41CX+ or RPN?

i41CX+ is rated higher. i41CX+ averages 4.8 out of 5 from 106 ratings, while RPN averages 4.3 from 6 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 every 5 weeks, and RPN every 3 months. Most recently, i41CX+ was updated on September 25, 2026 and RPN on September 21, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*