# Mike Holt's Electrical Toolbox vs Circuit Wiring Simulator

The clearest difference is in-app purchases: Mike Holt's Electrical Toolbox at none against Circuit Wiring Simulator's 10. Circuit Wiring Simulator's advantage is update cadence (every 2 weeks vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Circuit Wiring Simulator sells 10 one-off in-app purchases. Mike Holt's Electrical Toolbox asks for nothing beyond the download.

Mike Holt's Electrical Toolbox ships an update every 3 months, Circuit Wiring Simulator every 2 weeks. The most recent releases landed on October 26, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Mike Holt's Electrical Toolbox | Circuit Wiring Simulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (197 ratings)](https://appshunter.io/ios/app/mike-holts-electrical-toolbox/id1406630647/reviews)** | — |
| Number of ratings | **197** | — |
| Positive reviews | 76.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 26 MB | 48 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Mike Holt Enterprises](https://appshunter.io/developer/1349960186) | [沛洁 赖](https://appshunter.io/developer/1895142467) |

## 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- 🐛 Outdated information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


### Circuit Wiring Simulator

[App page](https://appshunter.io/ios/app/circuit-wiring-simulator/id6763458134)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 30-day-discount0_9 VIP | $4.49 | one-time |
| 30-day VIP | $4.99 | one-time |
| 90-day-discount0_9 VIP | $8.09 | one-time |
| 90-day VIP | $8.99 | one-time |
| One-year-discount0_9 VIP | $14.49 | one-time |
| One-year VIP | $15.90 | one-time |
| three-year-discount0_9 VIP | $22.49 | one-time |
| three-year VIP | $24.99 | one-time |
| Lifetime-discount0_9 VIP | $31.49 | one-time |
| Lifetime VIP | $34.99 | one-time |


## 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 Circuit Wiring Simulator free?

Circuit Wiring Simulator is free to download, with in-app purchases available.

### Do Mike Holt's Electrical Toolbox or Circuit Wiring Simulator have ads?

Neither Mike Holt's Electrical Toolbox nor Circuit Wiring Simulator shows ads.

### Which is updated more often, Mike Holt's Electrical Toolbox or Circuit Wiring Simulator?

Mike Holt's Electrical Toolbox ships an update every 3 months, and Circuit Wiring Simulator every 2 weeks. Most recently, Mike Holt's Electrical Toolbox was updated on October 26, 2026 and Circuit Wiring Simulator on October 31, 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.*