# i41CX vs RPN

The clearest difference is in-app purchases: RPN at none against i41CX's 4. RPN also leads on price ($2.99 vs $7.99) and iOS requirement (12.0 vs 16.0). i41CX's advantage is update cadence (weekly vs every 4 months) and review sentiment (90% vs 71%). On rating, ads and device support there is nothing between them.

i41CX costs $7.99 and RPN $2.99 up front. i41CX sells 4 one-off in-app purchases. RPN asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for i41CX against 4.8 for RPN. That said, the two scores are not equally well evidenced: i41CX has 47 ratings behind it against 6, so its average is the more settled of the two. Written reviews are what separate them: 90% of i41CX's written reviews are positive against 71% of RPN's.

i41CX ships an update weekly, RPN every 4 months. The most recent releases landed on November 8, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | i41CX | RPN |
| --- | --- | --- |
| Price | $7.99 | **$2.99** |
| Rating | [4.7 (47 ratings)](https://appshunter.io/ios/app/i41cx/id292619450/reviews) | **[4.8 (6 ratings)](https://appshunter.io/ios/app/rpn-45-hd/id424873500/reviews)** |
| Number of ratings | **47** | 6 |
| Positive reviews | **90.5% of reviews** | 70.8% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 4 months |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | **#162** | — |
| Size | 135 MB | 58 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/id292619450)

**Currently charting:** #162 Top Paid · Productivity (US App Store)

This advanced programmable RPN scientific calculator offers a powerful set of functions and a user-friendly interface. It emulates the functionality of a renowned calculator, with options to unlock advanced features through in-app purchases.

**Highlights:** RPN logic with 4-element stack, Over 300 built-in functions, Programmable up to 2000 lines, User-definable keyboard, Bluetooth keyboard support, Device integration features, Customizable skins and display

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Overlays Upgrade | $2.99 | one-time |
| Printer Upgrade | $3.99 | one-time |
| CAS Upgrade | $7.99 | one-time |
| i41CX+ Features Upgrade | $17.99 | one-time |


### RPN

[App page](https://appshunter.io/ios/app/rpn-45-hd/id424873500)

This app meticulously simulates a 1973 scientific calculator, offering an authentic vintage experience with advanced features. It includes a paper tape printer, complex number calculations, and enhanced statistical functions. Users can customize its appearance and even use it as a timer or chess clock.

**Highlights:** Photo-realistic HP-45 simulation, Animated keys with feedback, Full HP-45 function implementation, Paper tape printer with export, Complex number calculations, Enhanced statistical functions, Timer and chess clock modes

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is i41CX free?

i41CX costs $7.99, and also offers in-app purchases.

### Is RPN free?

RPN costs $2.99, with no in-app purchases.

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

RPN is rated higher. i41CX averages 4.7 out of 5 from 47 ratings, while RPN averages 4.8 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 weekly, and RPN every 4 months. Most recently, i41CX was updated on November 8, 2026 and RPN on November 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.*