# PTI Transformer vs WP 31s

The clearest difference is ratings volume: WP 31s at 15 against PTI Transformer's 1. On price, rating, update cadence and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for PTI Transformer against 4.9 for WP 31s. That said, the two scores are not equally well evidenced: WP 31s has 15 ratings behind it against 1, so its average is the more settled of the two.

PTI Transformer ships an update every 11 months, WP 31s every 10 months. The most recent releases landed on October 14, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | PTI Transformer | WP 31s |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pti-transformer/id522826739/reviews)** | [4.9 (15 ratings)](https://appshunter.io/ios/app/wp-31s/id973621300/reviews) |
| Number of ratings | 1 | **15** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 10 months** |
| Monetization | Free | Free |
| Size | 3 MB | 16 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Push Interactions, Inc.](https://appshunter.io/developer/357410200) | [Pascal Meheut](https://appshunter.io/developer/620255097) |

## What reviewers say

### PTI Transformer

[App page](https://appshunter.io/ios/app/pti-transformer/id522826739)

This app calculates electrical transformer performance metrics like current, voltage, efficiency, and regulation. It also offers SI/Metric conversions for various physical quantities and includes a tool for estimating ship dates based on order time.

**Highlights:** Transformer current, voltage, efficiency, and regulation calculation, SI/Metric unit conversions, Speed, force, power, area, pressure, volume, temperature, weights & measures conversions, Ship date estimation tool, Information about the developer

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 PTI Transformer free?

PTI Transformer is free to download, with no in-app purchases.

### Is WP 31s free?

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

### Which has better reviews, PTI Transformer or WP 31s?

PTI Transformer is rated higher. PTI Transformer averages 5.0 out of 5 from 1 ratings, while WP 31s averages 4.9 from 15 ratings.

### Do PTI Transformer or WP 31s have ads?

Neither PTI Transformer nor WP 31s shows ads.

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

PTI Transformer ships an update every 11 months, and WP 31s every 10 months. Most recently, PTI Transformer was updated on October 14, 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.*