# i41CX+ vs RPN

The clearest difference is price: RPN at Free against i41CX+'s $24.99. RPN also leads on review sentiment (100% vs 91%) and iOS requirement (12.0 vs 15.0). i41CX+'s advantage is update cadence (every 5 weeks vs every 7 months) and ratings volume (107 vs 11). On rating, ads, in-app purchases and device support there is nothing between them.

RPN is free to download; i41CX+ costs $24.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.8 for i41CX+ against 4.7 for RPN. That said, the two scores are not equally well evidenced: i41CX+ has 107 ratings behind it against 11, so its average is the more settled of the two. Written reviews are what separate them: 91% of i41CX+'s written reviews are positive against 100% of RPN's.

i41CX+ ships an update every 5 weeks, RPN every 7 months. The most recent releases landed on October 14, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | i41CX+ | RPN |
| --- | --- | --- |
| Price | $24.99 | **Free** |
| Rating | **[4.8 (107 ratings)](https://appshunter.io/ios/app/i41cx-plus/id289068865/reviews)** | [4.7 (11 ratings)](https://appshunter.io/ios/app/rpn-70-sd/id738422213/reviews) |
| Number of ratings | **107** | 11 |
| Positive reviews | 91.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 7 months |
| Monetization | Paid | **Free** |
| Size | 124 MB | 17 MB |
| Requires iOS | 15.0 | **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-70-sd/id738422213)

This app is a faithful simulation of a rare 1974 financial calculator, offering all its original functions with enhanced features like more memory registers and a visual stack display. It's designed for users who appreciate vintage technology and need precise financial calculations.

**Highlights:** Photo-realistic vintage calculator design, Full HP-70 function simulation, Animated keys with sound, Enhanced stack and memory register view, Cut/copy/paste display value, Input parameter visual indicators

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is i41CX+ free?

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

### Is RPN free?

RPN is free to download, with no in-app purchases.

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

i41CX+ is rated higher. i41CX+ averages 4.8 out of 5 from 107 ratings, while RPN averages 4.7 from 11 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 7 months. Most recently, i41CX+ was updated on October 14, 2026 and RPN on October 4, 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.*