# Mike Holt's Electrical Toolbox vs Building Wire Reliability Calc

The clearest difference is rating: Building Wire Reliability Calc at 5.0 against Mike Holt's Electrical Toolbox's 4.6. Building Wire Reliability Calc also leads on update cadence (every 3 weeks vs every 3 months). Mike Holt's Electrical Toolbox's advantage is ratings volume (197 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Building Wire Reliability Calc holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Mike Holt's Electrical Toolbox has 197 ratings behind it against 1, so its average is the more settled of the two.

Mike Holt's Electrical Toolbox ships an update every 3 months, Building Wire Reliability Calc every 3 weeks. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Mike Holt's Electrical Toolbox | Building Wire Reliability Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (197 ratings)](https://appshunter.io/ios/app/mike-holts-electrical-toolbox/id1406630647/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/building-wire-reliability-calc/id6747445082/reviews)** |
| Number of ratings | **197** | 1 |
| Positive reviews | 76.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 26 MB | 6 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mike Holt Enterprises](https://appshunter.io/developer/1349960186) | [Southwire Company](https://appshunter.io/developer/440338423) |

## What reviewers say

### Mike Holt's Electrical Toolbox

[App page](https://appshunter.io/ios/app/mike-holts-electrical-toolbox/id1406630647)

This app provides essential calculations for electricians, inspectors, contractors, and engineers. It helps determine conductor sizing, circuit protection, race sizing, and grounding conductor sizes for various electrical equipment and services.

**Highlights:** Conductor sizing, Voltage drop limitations, Circuit protection sizing, Race sizing, Equipment grounding conductor sizing, Dwelling-unit service calculations

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

**In-app purchases:** none

**What reviewers like**

- 👍 Great app for electricians
- 💡 Provides code article references
- 👍 Useful for on-the-spot reference
- 👍 Excellent for verifying calculations
- 👍 Helpful for exam preparation

**What reviewers complain about**

- 🐛 Emailing results not working
- 🐛 Outdated information
- 🐛 Load calc a little clunky
- 🐛 Content setup needs overhaul
- 🐛 Video series lacks completion system

**Reported bugs**

- Cannot email results
- Video player widescreen exit bug
- Previous calculation data not erased
- App content is outdated

**Requested features**

- Increase transformer capacity to 225kva
- Add option to print load calc
- Update to NEC 2020
- Add completion system for video series
- Refine user interface for better usability


### Building Wire Reliability Calc

[App page](https://appshunter.io/ios/app/building-wire-reliability-calc/id6747445082)

Calculate cable requirements for critical infrastructure. Optimize wire sizing for data centers, healthcare, and other heavily loaded systems. Ensure reliable electrical performance.

**Highlights:** Cable sizing for critical infrastructure, Wire reliability calculations, Supports data centers, Supports healthcare facilities, Optimizes heavily loaded systems

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mike Holt's Electrical Toolbox free?

Mike Holt's Electrical Toolbox is free to download, with no in-app purchases.

### Is Building Wire Reliability Calc free?

Building Wire Reliability Calc is free to download, with no in-app purchases.

### Which has better reviews, Mike Holt's Electrical Toolbox or Building Wire Reliability Calc?

Building Wire Reliability Calc is rated higher. Mike Holt's Electrical Toolbox averages 4.6 out of 5 from 197 ratings, while Building Wire Reliability Calc averages 5.0 from 1 ratings.

### Do Mike Holt's Electrical Toolbox or Building Wire Reliability Calc have ads?

Neither Mike Holt's Electrical Toolbox nor Building Wire Reliability Calc shows ads.

### Which is updated more often, Mike Holt's Electrical Toolbox or Building Wire Reliability Calc?

Mike Holt's Electrical Toolbox ships an update every 3 months, and Building Wire Reliability Calc every 3 weeks. Most recently, Mike Holt's Electrical Toolbox was updated on October 26, 2026 and Building Wire Reliability Calc on October 28, 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.*