# Mike Holt's Electrical Toolbox vs Box Fill 2

The clearest difference is price: Mike Holt's Electrical Toolbox at Free against Box Fill 2's $3.99. Mike Holt's Electrical Toolbox also leads on review sentiment (77% vs 33%) and rating (4.6 vs 3.3). Box Fill 2's advantage is update cadence (every 5 weeks vs every 3 months). On ads, in-app purchases and device support there is nothing between them.

Mike Holt's Electrical Toolbox is free to download; Box Fill 2 costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Mike Holt's Electrical Toolbox holds the better App Store score, 4.6 against 3.3. That said, the two scores are not equally well evidenced: Mike Holt's Electrical Toolbox has 197 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 77% of Mike Holt's Electrical Toolbox's written reviews are positive against 33% of Box Fill 2's.

Mike Holt's Electrical Toolbox ships an update every 3 months, Box Fill 2 every 5 weeks. The most recent releases landed on October 26, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Mike Holt's Electrical Toolbox | Box Fill 2 |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[4.6 (197 ratings)](https://appshunter.io/ios/app/mike-holts-electrical-toolbox/id1406630647/reviews)** | [3.3 (3 ratings)](https://appshunter.io/ios/app/box-fill-2/id1589765411/reviews) |
| Number of ratings | **197** | 3 |
| Positive reviews | **76.7% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Monetization | **Free** | Paid |
| Size | 26 MB | 19 MB |
| Requires iOS | **14.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mike Holt Enterprises](https://appshunter.io/developer/1349960186) | [Snappy Appz Inc.](https://appshunter.io/developer/375591377) |

## 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


### Box Fill 2

[App page](https://appshunter.io/ios/app/box-fill-2/id1589765411)

This utility app helps electricians and contractors perform precise electrical box fill calculations according to the latest codes. It also includes a comprehensive construction calculator for dimensional math, area, volume, and right-angle solutions.

**Highlights:** Electrical box fill calculations, Construction calculator, Dimensional math (feet-inches-fractions, metric), Area and volume calculations, Right-angle solutions, Shareable calculation reports, iCloud sync across devices

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

**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 Box Fill 2 free?

Box Fill 2 costs $3.99, with no in-app purchases.

### Which has better reviews, Mike Holt's Electrical Toolbox or Box Fill 2?

Mike Holt's Electrical Toolbox is rated higher. Mike Holt's Electrical Toolbox averages 4.6 out of 5 from 197 ratings, while Box Fill 2 averages 3.3 from 3 ratings.

### Do Mike Holt's Electrical Toolbox or Box Fill 2 have ads?

Neither Mike Holt's Electrical Toolbox nor Box Fill 2 shows ads.

### Which is updated more often, Mike Holt's Electrical Toolbox or Box Fill 2?

Mike Holt's Electrical Toolbox ships an update every 3 months, and Box Fill 2 every 5 weeks. Most recently, Mike Holt's Electrical Toolbox was updated on October 26, 2026 and Box Fill 2 on October 22, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*