# WP 31s vs Stack RPN Calculator

The clearest difference is review sentiment: WP 31s at 100% against Stack RPN Calculator's 33%. WP 31s also leads on rating (4.9 vs 3.5) and ratings volume (15 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

WP 31s holds the better App Store score, 4.9 against 3.5. That said, the two scores are not equally well evidenced: WP 31s has 15 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 100% of WP 31s's written reviews are positive against 33% of Stack RPN Calculator's.

## The numbers

| Metric | WP 31s | Stack RPN Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (15 ratings)](https://appshunter.io/ios/app/wp-31s/id973621300/reviews)** | [3.5 (2 ratings)](https://appshunter.io/ios/app/stack-rpn-calculator/id1493986697/reviews) |
| Number of ratings | **15** | 2 |
| Positive reviews | **100.0% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | — |
| Monetization | Free | Free |
| Size | 16 MB | 10 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pascal Meheut](https://appshunter.io/developer/620255097) | [Dario Bersiga](https://appshunter.io/developer/668388549) |

## 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


### Stack RPN Calculator

[App page](https://appshunter.io/ios/app/stack-rpn-calculator/id1493986697)

This scientific calculator displays major functions on screen and utilizes a stack for calculations. It supports a stack of up to 4 values but can store many more numbers depending on device memory.

**Highlights:** Visible scientific functions, RPN (Reverse Polish Notation) input, Stack display for up to 4 values, Large number storage capacity, Designed for iPhone and iPad

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is WP 31s free?

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

### Is Stack RPN Calculator free?

Stack RPN Calculator is free to download, with no in-app purchases.

### Which has better reviews, WP 31s or Stack RPN Calculator?

WP 31s is rated higher. WP 31s averages 4.9 out of 5 from 15 ratings, while Stack RPN Calculator averages 3.5 from 2 ratings.

### Do WP 31s or Stack RPN Calculator have ads?

Neither WP 31s nor Stack RPN Calculator shows ads.

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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.*