# 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 rating (5.0 vs 4.7). i41CX's advantage is update cadence (weekly vs every 4 months) and ratings volume (47 vs 8). On 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.

RPN holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: i41CX has 47 ratings behind it against 8, 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 100% of RPN's.

i41CX ships an update weekly, RPN every 4 months. The most recent releases landed on October 29, 2026 and October 31, 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) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/rpn-65-sd/id1176059659/reviews)** |
| Number of ratings | **47** | 8 |
| Positive reviews | 90.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 4 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 135 MB | 62 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | iPhone, iPad | 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/id292619450)

This app offers a powerful RPN scientific calculator experience, functionally equivalent to a renowned model. It provides extensive memory registers, over 300 built-in functions, and programmability. Advanced features can be unlocked via in-app purchases.

**Highlights:** RPN logic with 4-element stack, 319 main and 124 extended memory registers, Over 300 built-in functions, Programmable up to 2000 lines, User-definable keyboard, Bluetooth keyboard support, Device integration features

**Features:** 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-65-sd/id1176059659)

Experience a faithful simulation of the groundbreaking HP-65 programmable calculator on your iPhone. This app offers virtual program and data cards, a paper tape printer, and a robust card manager. Explore four distinct operating modes, including an enhanced "Super-65" option.

**Highlights:** Virtual program and data cards, Virtual paper tape printer with AirPrint, Database-driven card manager, Create, delete, and organize unlimited cards, Sharing via email, AirDrop, Dropbox, iTunes, Paste and run existing HP-65 listings, Four distinct operating modes

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

**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 5.0 from 8 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 October 29, 2026 and RPN on October 31, 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.*