# Lineman's Reference vs BHBJJ

The clearest difference is price: BHBJJ at Free against Lineman's Reference's $19.99. Lineman's Reference's advantage is chart position (#13 vs unranked). On update cadence, ads, in-app purchases and device support there is nothing between them.

BHBJJ 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, BHBJJ every 2 months. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Lineman's Reference | BHBJJ |
| --- | --- | --- |
| Price | $19.99 | **Free** |
| Rating | **[4.7 (432 ratings)](https://appshunter.io/ios/app/linemans-reference-xfmr-lab/id1583878194/reviews)** | — |
| Number of ratings | **432** | — |
| Positive reviews | 62.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 2 months |
| Monetization | Paid | — |
| Best chart rank | **#13** | — |
| Size | 65 MB | 63 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Digital Apprentice LLC](https://appshunter.io/developer/1565687382) | [Tapp, LLC](https://appshunter.io/developer/1466940621) |

## What reviewers say

### Lineman's Reference

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

**Currently charting:** #13 Top Paid · Education, #159 Top Paid (US App Store)

This app simulates electrical transformer banks, allowing users to practice wiring, metering, fusing, and faulting. It offers guided lessons for beginners and a sandbox mode for advanced customization and scenario-based challenges.

**Highlights:** Transformer bank simulation, Guided training lessons, Customizable sandbox mode, Scenario-based challenges, Interactive wiring and faulting, Progress tracking and quizzes, Reference diagrams and tools

**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


### BHBJJ

[App page](https://appshunter.io/ios/app/bhbjj/id1631691163)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Lineman's Reference free?

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

### Is BHBJJ free?

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

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

Neither Lineman's Reference nor BHBJJ shows ads.

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

Lineman's Reference ships an update every 4 weeks, and BHBJJ every 2 months. Most recently, Lineman's Reference was updated on November 7, 2026 and BHBJJ on November 3, 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.*