PTI Transformer vs WP 31s
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PTI Transformer
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.
- 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
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PTI "Transform"er calculates electrical transformer current, phase voltage, efficiency & regulation at various loads and power factors and provides SI/Metric conversions for Speed, Force, Power, Area, Pressure, Volume, Temperature, Weights & Measures. A handy calculator for determining ship date from any date using weeks after order (ARO) is also included. Interesting facts about PTI and what we do appear as you navigate through the application. Disclaimer: All conversions if used for critical calculations should be verified with a secondary source.
WP 31s
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.
- RPN scientific calculator emulation
- Rich function set
- Simplified, less cluttered keyboard
- Based on WP 34s
- Available on iOS
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WP 31s is a classic RPN scientific calculator based on the powerful but more complex WP 34s. Now available on iOS too (see the support site for other emulators and for the real stuff). It is not programmable but has a rich function set for daily use and is easier to use, thanks to a less cluttered keyboard. A manual can be downloaded at http://sourceforge.net/projects/wp34s/files/doc/Manual_wp_31s_1_2q.pdf/download
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | PTI Transformer | WP 31s |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 4.9 (15 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 15 — better |
| Update frequency | Every 11 months | Every 10 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 3 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Push Interactions, Inc. | Pascal Meheut |
Customer experience
PTI Transformer
WP 31s
In-app purchases
PTI Transformer
No in-app purchases
WP 31s
No in-app purchases
