# 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 review sentiment (100% vs 90%). i41CX's advantage is update cadence (every 5 weeks vs every 7 months) and ratings volume (45 vs 11). On rating, 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.

On the App Store both sit at effectively the same score — 4.6 for i41CX against 4.7 for RPN. Both are backed by a comparable volume of ratings — 45 and 11 respectively. Written reviews are what separate them: 90% of i41CX's written reviews are positive against 100% of RPN's.

i41CX ships an update every 5 weeks, RPN every 7 months. The most recent releases landed on October 17, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | i41CX | RPN |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | [4.6 (45 ratings)](https://appshunter.io/ios/app/i41cx/id292619450/reviews) | **[4.7 (11 ratings)](https://appshunter.io/ios/app/rpn-70-sd/id738422213/reviews)** |
| Number of ratings | **45** | 11 |
| Positive reviews | 90.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 7 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 135 MB | 17 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | 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

**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-70-sd/id738422213)

This app is a faithful simulation of a rare 1974 financial calculator, offering all its original functions with enhanced features like more memory registers and a visual stack display. It's designed for users who appreciate vintage technology and need precise financial calculations.

**Highlights:** Photo-realistic vintage calculator design, Full HP-70 function simulation, Animated keys with sound, Enhanced stack and memory register view, Cut/copy/paste display value, Input parameter visual indicators

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

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

RPN is rated higher. i41CX averages 4.6 out of 5 from 45 ratings, while RPN averages 4.7 from 11 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 5 weeks, and RPN every 7 months. Most recently, i41CX was updated on October 17, 2026 and RPN on October 4, 2026.

---

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