# i41CX+ vs RPN

The clearest difference is price: RPN at $1.99 against i41CX+'s $24.99. RPN also leads on chart position (#184 vs unranked). i41CX+'s advantage is rating (4.8 vs 4.4) and update cadence (every 5 weeks vs every 6 months). On ads, in-app purchases, monetization model and device support there is nothing between them.

i41CX+ costs $24.99 and RPN $1.99 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 4.4. That said, the two scores are not equally well evidenced: i41CX+ has 106 ratings behind it against 14, 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 71% of RPN's.

i41CX+ ships an update every 5 weeks, RPN every 6 months. The most recent releases landed on September 23, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | i41CX+ | RPN |
| --- | --- | --- |
| Price | $24.99 | **$1.99** |
| Rating | **[4.8 (106 ratings)](https://appshunter.io/ios/app/i41cx-plus/id289068865/reviews)** | [4.4 (14 ratings)](https://appshunter.io/ios/app/rpn-35-sd/id956224485/reviews) |
| Number of ratings | **106** | 14 |
| Positive reviews | **91.3% of reviews** | 71.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 6 months |
| Monetization | Paid | Paid |
| Best chart rank | — | **#184** |
| Size | 123 MB | 14 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| 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-35-sd/id956224485)

**Currently charting:** #184 Top Paid · Productivity (US App Store)

This app emulates the first pocket scientific calculator, offering a photo-realistic vintage experience. It simulates original operating speeds and unique arithmetic bugs, with optional modern enhancements like non-volatile registers.

**Highlights:** Photo-realistic look-and-feel, Multiple vintage skins, Vintage and Enhanced modes, Optional key-click and key-glow, Swipe to correct input, Display stack and memory 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 $1.99, 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 4.4 from 14 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 6 months. Most recently, i41CX+ was updated on September 23, 2026 and RPN on September 6, 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.*