# Lineman's Reference vs Graylight

The clearest difference is price: Graylight at Free against Lineman's Reference's $19.99. Graylight also leads on review sentiment (89% vs 62%) and rating (4.8 vs 4.6). Lineman's Reference's advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

Graylight is free to download; Lineman's Reference costs $19.99 up front. Graylight sells 1 in-app purchase, starting at $9.99 per month. Lineman's Reference asks for nothing beyond the download.

Graylight holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Lineman's Reference has 307 ratings behind it against 33, so its average is the more settled of the two. Written reviews point the same way: 62% of Lineman's Reference's written reviews are positive against 89% of Graylight's.

Lineman's Reference ships an update every 4 weeks, Graylight every 7 months. The most recent releases landed on October 14, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Lineman's Reference | Graylight |
| --- | --- | --- |
| Price | $19.99 | **Free** |
| Rating | [4.6 (307 ratings)](https://appshunter.io/ios/app/linemans-reference-xfmr-lab/id1583878194/reviews) | **[4.8 (33 ratings)](https://appshunter.io/ios/app/graylight/id6443885710/reviews)** |
| Number of ratings | **307** | 33 |
| Positive reviews | 62.2% of reviews | **89.5% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 weeks** | Every 7 months |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | **#10** | — |
| Size | 65 MB | 91 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Digital Apprentice LLC](https://appshunter.io/developer/1565687382) | [Marlon Holden](https://appshunter.io/developer/1650298501) |

## What reviewers say

### Lineman's Reference

[App page](https://appshunter.io/ios/app/linemans-reference-xfmr-lab/id1583878194)

**Currently charting:** #10 Top Paid · Education, #101 Top Paid (US App Store)

This interactive simulator allows users to study and learn transformer connections. Test your wiring with various meters, and experience consequences of improper connections. Includes reference diagrams, informational material, and a quiz mode to test knowledge.

**Highlights:** Transformer connection simulation, Volt, ohm, and rotation meters, Abnormal voltage and fuse explosion simulation, Transformer nameplate and coil inspection, Quick reference diagrams, Informational reading material, Quiz and advanced quiz modes

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

**In-app purchases:** none

**What reviewers like**

- 👍 Great for learning
- 👍 Helpful for apprentices
- 👍 Useful practice tool
- 👍 Good concept
- 👍 Excellent labs and sandbox

**What reviewers complain about**

- 🐛 Too many bugs
- 🐛 App is clunky
- 🐛 Wiring issues
- 🐛 Incorrect diagrams
- 🐛 Incorrect quiz answers

**Reported bugs**

- Tutorial loop
- Lines not connecting
- Cannot wire up all banks
- WYE Delta is wrong
- Cannot bus secondary x2 to x2 bushing for delta secondaries

**Requested features**

- Ability to build own banks
- Add tap changer settings
- Add vector charts
- Add more labs with different scenarios
- Create your own bank option


### Graylight

[App page](https://appshunter.io/ios/app/graylight/id6443885710)

This educational app offers comprehensive courses and field-tested techniques for bowhunting mule deer. Learn habitat, scouting, stalking, and bow tuning strategies directly from an experienced hunter. Connect with a community of users and access exclusive content to improve your hunting success.

**Highlights:** Mule deer bowhunting courses, Habitat and scouting strategies, Glassing and stalking techniques, Bow tuning lessons, Field-recorded insights, Community sharing and Q&A

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Subscription | $9.99 | per month |


## Frequently asked questions

### Is Lineman's Reference free?

Lineman's Reference costs $19.99, with no in-app purchases.

### Is Graylight free?

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

### Which has better reviews, Lineman's Reference or Graylight?

Graylight is rated higher. Lineman's Reference averages 4.6 out of 5 from 307 ratings, while Graylight averages 4.8 from 33 ratings.

### Do Lineman's Reference or Graylight have ads?

Graylight shows ads; Lineman's Reference does not.

### Which is updated more often, Lineman's Reference or Graylight?

Lineman's Reference ships an update every 4 weeks, and Graylight every 7 months. Most recently, Lineman's Reference was updated on October 14, 2026 and Graylight 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.*