# WP 31s vs RLM

The clearest difference is in-app purchases: WP 31s at none against RLM's 4. WP 31s also leads on review sentiment (100% vs 67%) and iOS requirement (12.0 vs 15.0). RLM's advantage is update cadence (every 3 weeks vs every 10 months). On price, rating, ratings volume and ads 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.

On the App Store both sit at effectively the same score — 4.9 for WP 31s against 4.9 for RLM. Both are backed by a comparable volume of ratings — 15 and 7 respectively. Written reviews are what separate them: 100% of WP 31s's written reviews are positive against 67% of RLM's.

WP 31s ships an update every 10 months, RLM every 3 weeks. 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) | [4.9 (7 ratings)](https://appshunter.io/ios/app/rlm-19bx/id1597086394/reviews) |
| Number of ratings | **15** | 7 |
| Positive reviews | **100.0% of reviews** | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 3 weeks** |
| 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-19bx/id1597086394)

This app offers a comprehensive suite of financial, business, scientific, and statistical calculators. It includes specialized worksheets for loan amortization, bond pricing, currency exchange, probability distributions, and complex number operations. Users can also perform date and time calculations, solve arbitrary equations, and convert units.

**Highlights:** Finance worksheets (amortization, bonds, options), Business tools (bill split, break-even, currency), Statistical analysis (probability, regressions), Scientific functions (complex numbers, vectors), Unit and currency conversions, Equation solver, Date and time calculations

**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 |
| Lifetime 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 and RLM are both rated 4.9 out of 5 on the App Store, from 15 and 7 ratings respectively.

### 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 every 3 weeks. 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.*