# PTI Transformer vs Electrical Tools & Reference

The clearest difference is in-app purchases: PTI Transformer at none against Electrical Tools & Reference's 2. Electrical Tools & Reference's advantage is update cadence (every 3 weeks vs every 11 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Electrical Tools & Reference sells 2 in-app purchases, starting at $2.99 per month. PTI Transformer asks for nothing beyond the download.

PTI Transformer ships an update every 11 months, Electrical Tools & Reference every 3 weeks. The most recent releases landed on June 24, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | PTI Transformer | Electrical Tools & Reference |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pti-transformer/id522826739/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 3 MB | 88 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) | [Ashvin Kevadiya](https://appshunter.io/developer/1756324971) |

## 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


### Electrical Tools & Reference

[App page](https://appshunter.io/ios/app/electrical-tools-and-reference/id6746714702)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Lifetime Premium | $3.99 | one-time |


## Frequently asked questions

### Is PTI Transformer free?

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

### Is Electrical Tools & Reference free?

Electrical Tools & Reference is free to download, with in-app purchases available.

### Do PTI Transformer or Electrical Tools & Reference have ads?

Neither PTI Transformer nor Electrical Tools & Reference shows ads.

### Which is updated more often, PTI Transformer or Electrical Tools & Reference?

PTI Transformer ships an update every 11 months, and Electrical Tools & Reference every 3 weeks. Most recently, PTI Transformer was updated on June 24, 2026 and Electrical Tools & Reference on September 18, 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.*