# Mike Holt's Electrical Toolbox vs Conduit Fill

The clearest difference is price: Mike Holt's Electrical Toolbox at Free against Conduit Fill's $4.99. Mike Holt's Electrical Toolbox also leads on rating (4.6 vs 3.3) and ratings volume (198 vs 3). Conduit Fill's advantage is iOS requirement (12.0 vs 14.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Mike Holt's Electrical Toolbox is free to download; Conduit Fill costs $4.99 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 198 ratings behind it against 3, so its average is the more settled of the two.

Mike Holt's Electrical Toolbox ships an update every 3 months, Conduit Fill every 5 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Mike Holt's Electrical Toolbox | Conduit Fill |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[4.6 (198 ratings)](https://appshunter.io/ios/app/mike-holts-electrical-toolbox/id1406630647/reviews)** | [3.3 (3 ratings)](https://appshunter.io/ios/app/conduit-fill/id6469908455/reviews) |
| Number of ratings | **198** | 3 |
| Positive reviews | 76.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 5 months |
| Monetization | **Free** | Paid |
| Size | 26 MB | 23 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Mike Holt Enterprises](https://appshunter.io/developer/1349960186) | [Martin Loch](https://appshunter.io/developer/1385872283) |

## 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


### Conduit Fill

[App page](https://appshunter.io/ios/app/conduit-fill/id6469908455)

This app helps electricians quickly calculate conduit fill based on the latest NEC or CEC codes. Easily add various wire types and quantities to determine the minimum required conduit size.

**Highlights:** NEC and CEC code calculations, Support for up to 1000 wires, Select from different wire types, Instant calculation for all conduit sizes, Minimized display for most common sizes

**Features:** 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 Conduit Fill free?

Conduit Fill costs $4.99, with no in-app purchases.

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

Mike Holt's Electrical Toolbox is rated higher. Mike Holt's Electrical Toolbox averages 4.6 out of 5 from 198 ratings, while Conduit Fill averages 3.3 from 3 ratings.

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

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

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

Mike Holt's Electrical Toolbox ships an update every 3 months, and Conduit Fill every 5 months. Most recently, Mike Holt's Electrical Toolbox was updated on November 6, 2026 and Conduit Fill 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.*