# i41CX vs WP 31s

The clearest difference is price: WP 31s at Free against i41CX's $7.99. WP 31s also leads on in-app purchases (none vs 4) and rating (4.9 vs 4.6). i41CX's advantage is update cadence (every 5 weeks vs every 10 months) and ratings volume (45 vs 15). On ads and device support there is nothing between them.

WP 31s is free to download; i41CX costs $7.99 up front. i41CX sells 4 one-off in-app purchases. WP 31s asks for nothing beyond the download.

WP 31s holds the better App Store score, 4.9 against 4.6. Both are backed by a comparable volume of ratings — 45 and 15 respectively. Written reviews point the same way: 90% of i41CX's written reviews are positive against 100% of WP 31s's.

i41CX ships an update every 5 weeks, WP 31s every 10 months. The most recent releases landed on October 17, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | i41CX | WP 31s |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | [4.6 (45 ratings)](https://appshunter.io/ios/app/i41cx/id292619450/reviews) | **[4.9 (15 ratings)](https://appshunter.io/ios/app/wp-31s/id973621300/reviews)** |
| Number of ratings | **45** | 15 |
| Positive reviews | 90.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 10 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 135 MB | 16 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Antonio Lagana](https://appshunter.io/developer/289068868) | [Pascal Meheut](https://appshunter.io/developer/620255097) |

## 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 |


### WP 31s

[App page](https://appshunter.io/ios/app/wp-31s/id973621300)

This app emulates a classic RPN scientific calculator, offering a rich function set for daily use with a simplified interface. It's based on the more complex WP 34s but is designed for easier operation.

**Highlights:** RPN scientific calculator emulation, Rich function set, Simplified, less cluttered keyboard, Based on WP 34s, Available on iOS

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is i41CX free?

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

### Is WP 31s free?

WP 31s is free to download, with no in-app purchases.

### Which has better reviews, i41CX or WP 31s?

WP 31s is rated higher. i41CX averages 4.6 out of 5 from 45 ratings, while WP 31s averages 4.9 from 15 ratings.

### Do i41CX or WP 31s have ads?

Neither i41CX nor WP 31s shows ads.

### Which is updated more often, i41CX or WP 31s?

i41CX ships an update every 5 weeks, and WP 31s every 10 months. Most recently, i41CX was updated on October 17, 2026 and WP 31s on October 11, 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.*