# WP 31s vs RPN

The clearest difference is review sentiment: WP 31s at 100% against RPN's 50%. WP 31s also leads on price (Free vs $3.99) and rating (4.9 vs 4.0). RPN's advantage is update cadence (every 3 months vs every 10 months). On ads, in-app purchases and iOS requirement there is nothing between them.

WP 31s is free to download; RPN costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

WP 31s holds the better App Store score, 4.9 against 4.0. Both are backed by a comparable volume of ratings — 15 and 4 respectively. Written reviews point the same way: 100% of WP 31s's written reviews are positive against 50% of RPN's.

WP 31s ships an update every 10 months, RPN every 3 months. Both last shipped on November 2, 2026.

## The numbers

| Metric | WP 31s | RPN |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[4.9 (15 ratings)](https://appshunter.io/ios/app/wp-31s/id973621300/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/rpn-65-pro/id1033260498/reviews) |
| Number of ratings | **15** | 4 |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 3 months** |
| Monetization | **Free** | Paid |
| Size | 16 MB | 86 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Pascal Meheut](https://appshunter.io/developer/620255097) | [CuVee Software](https://appshunter.io/developer/424873503) |

## 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


### RPN

[App page](https://appshunter.io/ios/app/rpn-65-pro/id1033260498)

Experience a faithful simulation of the groundbreaking HP-65 programmable calculator on your iPad. This app offers virtual program and data cards, a powerful card manager, and includes 170 original HP programs to get you started.

**Highlights:** Virtual program and data cards, Virtual paper tape printer, Database-driven card manager, Create, delete, label, and organize cards, Share via email, AirDrop, Dropbox, print, Paste and run existing HP-65 listings, Live display of stack and registers, Four operational modes including 'Super-65'

**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 RPN free?

RPN costs $3.99, with no in-app purchases.

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

WP 31s is rated higher. WP 31s averages 4.9 out of 5 from 15 ratings, while RPN averages 4.0 from 4 ratings.

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

Neither WP 31s nor RPN shows ads.

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

WP 31s ships an update every 10 months, and RPN every 3 months. Most recently, WP 31s was updated on November 2, 2026 and RPN on November 2, 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.*