# WP 31s vs RLM

The clearest difference is rating: WP 31s at 4.9 against RLM's 4.1. WP 31s also leads on in-app purchases (none vs 4) and review sentiment (100% vs 80%). RLM's advantage is update cadence (monthly vs every 10 months). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. RLM sells 4 in-app purchases, starting at $0.49 per month. WP 31s asks for nothing beyond the download.

WP 31s holds the better App Store score, 4.9 against 4.1. Both are backed by a comparable volume of ratings — 15 and 17 respectively. Written reviews point the same way: 100% of WP 31s's written reviews are positive against 80% of RLM's.

WP 31s ships an update every 10 months, RLM monthly. The most recent releases landed on June 11, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | WP 31s | RLM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (15 ratings)](https://appshunter.io/ios/app/wp-31s/id973621300/reviews)** | [4.1 (17 ratings)](https://appshunter.io/ios/app/rlm-15cx/id1636646608/reviews) |
| Number of ratings | 15 | **17** |
| Positive reviews | **100.0% of reviews** | 80.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 16 MB | 6 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pascal Meheut](https://appshunter.io/developer/620255097) | [R.L.M. Software](https://appshunter.io/developer/289639238) |

## What reviewers say

### 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


### RLM

[App page](https://appshunter.io/ios/app/rlm-15cx/id1636646608)

This advanced scientific calculator emulates the functionality of the HP-15C, offering comprehensive tools for finance, business, statistics, and scientific calculations. It supports programming, equation solving, and unit conversions, optimized for iOS devices.

**Highlights:** Programmable advanced scientific calculator, Finance and business calculation menus, Statistics and probability functions, Complex numbers and matrix operations, Unit and currency conversions, Equation solver and programming capabilities

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $0.49 | per month |
| Semi-Annual Subscription | $2.99 | per 6 months |
| Annual Subscription | $5.99 | per year |
| One-Time Purchase | $9.99 | one-time |


## Frequently asked questions

### Is WP 31s free?

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

### Is RLM free?

RLM is free to download, with in-app purchases available.

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

WP 31s is rated higher. WP 31s averages 4.9 out of 5 from 15 ratings, while RLM averages 4.1 from 17 ratings.

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

Neither WP 31s nor RLM shows ads.

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

WP 31s ships an update every 10 months, and RLM monthly. Most recently, WP 31s was updated on June 11, 2026 and RLM on September 10, 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.*