# i41CX+ vs RPN

The clearest difference is price: RPN at Free against i41CX+'s $24.99. RPN also leads on rating (5.0 vs 4.8) and iOS requirement (12.0 vs 16.0). i41CX+'s advantage is update cadence (every 2 days vs every 9 months) and ratings volume (108 vs 3). On 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.

RPN holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: i41CX+ has 108 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 91% of i41CX+'s written reviews are positive against 83% of RPN's, so the app with the better star average is not the one people write more warmly about.

i41CX+ ships an update every 2 days, RPN every 9 months. The most recent releases landed on November 12, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | i41CX+ | RPN |
| --- | --- | --- |
| Price | $24.99 | **Free** |
| Rating | [4.8 (108 ratings)](https://appshunter.io/ios/app/i41cx-plus/id289068865/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/rpn-70-hd/id436127144/reviews)** |
| Number of ratings | **108** | 3 |
| Positive reviews | **91.4% of reviews** | 83.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 9 months |
| Monetization | Paid | **Free** |
| Size | 124 MB | 14 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | **iPhone, iPad** | 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 CAS capabilities, emulating the HP-41CX with extensive modules and programs. It features a virtual thermal printer/plotter, iCloud support, and a full-screen text editor for enhanced productivity.

**Highlights:** RPN logic with 4-element stack, Virtual thermal printer/plotter, Workstation-class Computer Algebra System (CAS), Full HP-41CX emulation and module support, Programmable with unlimited lines, iCloud syncing and extensive import/export, Full-screen text editor with configurable keyboard

**Features:** macOS Compatibility, iPhone Duo support

**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-hd/id436127144)

This app provides a photo-realistic simulation of a rare 1974 financial calculator, offering full functionality for loan amortization, saving plans, and depreciation. It features an authentic design with animated keys and an optional live register view.

**Highlights:** Photo-realistic design, Live register view, Animated keys with sound, Full HP-70 function implementation, Cut/copy/paste display value, Built-in manual with examples

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

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

RPN is rated higher. i41CX+ averages 4.8 out of 5 from 108 ratings, while RPN averages 5.0 from 3 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 2 days, and RPN every 9 months. Most recently, i41CX+ was updated on November 12, 2026 and RPN on November 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.*