# i41CX vs RPN

The clearest difference is price: RPN at Free against i41CX's $7.99. RPN also leads on in-app purchases (none vs 4) and iOS requirement (12.0 vs 16.0). i41CX's advantage is rating (4.7 vs 4.0) and update cadence (weekly vs every 5 months). On review sentiment, ads and device support there is nothing between them.

RPN is free to download; i41CX costs $7.99 up front. i41CX sells 4 one-off in-app purchases. RPN asks for nothing beyond the download.

i41CX holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: i41CX has 47 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 90% of i41CX's written reviews are positive against 83% of RPN's.

i41CX ships an update weekly, RPN every 5 months. The most recent releases landed on November 8, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | i41CX | RPN |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | **[4.7 (47 ratings)](https://appshunter.io/ios/app/i41cx/id292619450/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/rpn-67-np/id603100249/reviews) |
| Number of ratings | **47** | 4 |
| Positive reviews | **90.5% of reviews** | 83.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 5 months |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#116** | — |
| Size | 135 MB | 38 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:** #116 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-67-np/id603100249)

This app simulates a legendary vintage scientific calculator, offering a "live" display of its internal states and a virtual paper tape printer. It allows loading and running original sample programs, with advanced features that can be switched off for an authentic experience.

**Highlights:** Live display of stack and registers, Virtual paper tape printer, Email or print paper tape, Cut/copy/paste display value, 30 selectable background images, Non-volatile memory

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

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

i41CX is rated higher. i41CX averages 4.7 out of 5 from 47 ratings, while RPN averages 4.0 from 4 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 5 months. Most recently, i41CX was updated on November 8, 2026 and RPN on November 1, 2026.

---

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