# i41CX vs RPN

The clearest difference is rating: i41CX at 4.7 against RPN's 4.0. i41CX also leads on review sentiment (90% vs 50%) and update cadence (every 3 days vs every 3 months). RPN's advantage is in-app purchases (none vs 4) and price ($3.99 vs $7.99). On ads and device support there is nothing between them.

i41CX costs $7.99 and RPN $3.99 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 50% of RPN's.

i41CX ships an update every 3 days, RPN every 3 months. The most recent releases landed on November 10, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | i41CX | RPN |
| --- | --- | --- |
| Price | $7.99 | **$3.99** |
| Rating | **[4.7 (47 ratings)](https://appshunter.io/ios/app/i41cx/id292619450/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/rpn-65-pro/id1033260498/reviews) |
| Number of ratings | **47** | 4 |
| Positive reviews | **90.5% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 3 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 135 MB | 86 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)

This app offers a powerful RPN scientific calculator experience, functionally equivalent to the HP-41CX. It includes over 300 built-in functions, programmability, and device integrations. Advanced features can be unlocked via 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, Calculator skins and mini stack 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-65-pro/id1033260498)

Experience a faithful simulation of the groundbreaking HP-65 programmable calculator on your iPad. This app offers virtual program and data cards, a powerful card manager, and includes 170 original HP programs to get you started.

**Highlights:** Virtual program and data cards, Virtual paper tape printer, Database-driven card manager, Create, delete, label, and organize cards, Share via email, AirDrop, Dropbox, print, Paste and run existing HP-65 listings, Live display of stack and registers, Four operational modes including 'Super-65'

**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 $3.99, 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 every 3 days, and RPN every 3 months. Most recently, i41CX was updated on November 10, 2026 and RPN on November 2, 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.*