# Lineman's Reference vs KnowledgeVine

The clearest difference is price: KnowledgeVine at Free against Lineman's Reference's $19.99. Lineman's Reference's advantage is update cadence (every 4 weeks vs every 2 months) and chart position (#6 vs unranked). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

KnowledgeVine is free to download; Lineman's Reference costs $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Lineman's Reference ships an update every 4 weeks, KnowledgeVine every 2 months. The most recent releases landed on September 22, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Lineman's Reference | KnowledgeVine |
| --- | --- | --- |
| Price | $19.99 | **Free** |
| Rating | **[4.6 (307 ratings)](https://appshunter.io/ios/app/linemans-reference-xfmr-lab/id1583878194/reviews)** | — |
| Number of ratings | **307** | — |
| Positive reviews | 62.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 2 months |
| Monetization | Free | — |
| Best chart rank | **#6** | — |
| Size | 65 MB | 26 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) | [Knowledge Vine, LLC](https://appshunter.io/developer/1325657464) |

## What reviewers say

### Lineman's Reference

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

**Currently charting:** #6 Top Paid · Education, #189 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


### KnowledgeVine

[App page](https://appshunter.io/ios/app/knowledgevine/id1637147448)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Lineman's Reference free?

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

### Is KnowledgeVine free?

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

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

Neither Lineman's Reference nor KnowledgeVine shows ads.

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

Lineman's Reference ships an update every 4 weeks, and KnowledgeVine every 2 months. Most recently, Lineman's Reference was updated on September 22, 2026 and KnowledgeVine on September 16, 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.*