# Overhead Install Guide vs Transformer Calculator.

The clearest difference is in-app purchases: Overhead Install Guide at none against Transformer Calculator.'s 1. Overhead Install Guide also leads on ads (none vs shown). Transformer Calculator.'s advantage is rating (4.8 vs 4.6) and update cadence (every 4 months vs every 9 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Transformer Calculator. sells 1 one-off in-app purchase. Overhead Install Guide asks for nothing beyond the download.

Transformer Calculator. holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Transformer Calculator. has 48 ratings behind it against 5, so its average is the more settled of the two.

Overhead Install Guide ships an update every 9 months, Transformer Calculator. every 4 months. The most recent releases landed on October 6, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Overhead Install Guide | Transformer Calculator. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (5 ratings)](https://appshunter.io/ios/app/overhead-install-guide/id1353512021/reviews) | **[4.8 (48 ratings)](https://appshunter.io/ios/app/transformer-calculator/id1506155081/reviews)** |
| Number of ratings | 5 | **48** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 months | **Every 4 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 21 MB | 41 MB |
| Requires iOS | **16.6** | 17.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Southwire Company](https://appshunter.io/developer/440338423) | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) |

## What reviewers say

### Overhead Install Guide

[App page](https://appshunter.io/ios/app/overhead-install-guide/id1353512021)

This utility app offers Southwire's official recommendations for installing overhead transmission electrical conductors. It provides essential field information and includes a calculator for determining bullwheel and block diameters.

**Highlights:** Overhead conductor installation recommendations, Information from Overhead Conductor Manual, Industry standard IEEE 524 data, Bullwheel and block diameter calculator

**Features:** macOS Compatibility

**In-app purchases:** none


### Transformer Calculator.

[App page](https://appshunter.io/ios/app/transformer-calculator/id1506155081)

This app simplifies transformer calculations for engineers and students. It accurately computes primary and secondary currents, turns ratios, and secondary voltages based on user inputs for transformer ratings and winding turns.

**Highlights:** Primary and secondary current calculations, Turns ratio determination, Transformer type identification, Secondary voltage calculation, Supports 1Φ and 3Φ phases, User-friendly interface

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Go Pro | $3.99 | one-time |


## Frequently asked questions

### Is Overhead Install Guide free?

Overhead Install Guide is free to download, with no in-app purchases.

### Is Transformer Calculator. free?

Transformer Calculator. is free to download, with in-app purchases available.

### Which has better reviews, Overhead Install Guide or Transformer Calculator.?

Transformer Calculator. is rated higher. Overhead Install Guide averages 4.6 out of 5 from 5 ratings, while Transformer Calculator. averages 4.8 from 48 ratings.

### Do Overhead Install Guide or Transformer Calculator. have ads?

Transformer Calculator. shows ads; Overhead Install Guide does not.

### Which is updated more often, Overhead Install Guide or Transformer Calculator.?

Overhead Install Guide ships an update every 9 months, and Transformer Calculator. every 4 months. Most recently, Overhead Install Guide was updated on October 6, 2026 and Transformer Calculator. on October 10, 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.*