# Ohm's Law vs Mike Holt's Electrical Toolbox

The clearest difference is in-app purchases: Mike Holt's Electrical Toolbox at none against Ohm's Law's 1. Ohm's Law's advantage is iOS requirement (9.0 vs 14.0). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Ohm's Law sells 1 one-off in-app purchase. Mike Holt's Electrical Toolbox asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for Ohm's Law against 4.6 for Mike Holt's Electrical Toolbox. Both are backed by a comparable volume of ratings — 172 and 198 respectively. Written reviews are what separate them: 81% of Ohm's Law's written reviews are positive against 77% of Mike Holt's Electrical Toolbox's.

Ohm's Law ships an update every 4 months, Mike Holt's Electrical Toolbox every 3 months. Both last shipped on November 6, 2026.

## The numbers

| Metric | Ohm's Law | Mike Holt's Electrical Toolbox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (172 ratings)](https://appshunter.io/ios/app/ohms-law/id389305829/reviews)** | [4.6 (198 ratings)](https://appshunter.io/ios/app/mike-holts-electrical-toolbox/id1406630647/reviews) |
| Number of ratings | 172 | **198** |
| Positive reviews | **80.7% of reviews** | 76.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 9 MB | 26 MB |
| Requires iOS | **9.0** | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Creature Code Mobile, LLC](https://appshunter.io/developer/386736750) | [Mike Holt Enterprises](https://appshunter.io/developer/1349960186) |

## What reviewers say

### Ohm's Law

[App page](https://appshunter.io/ios/app/ohms-law/id389305829)

This utility app calculates electrical resistance, voltage, and current using Ohm's Law. It provides a quick and easy way to solve electrical formulas for various applications.

**Highlights:** Ohm's Law calculations, Voltage calculation, Current calculation, Resistance calculation, Electrical formula solver

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |

**What reviewers like**

- 👍 Extremely user-friendly and intuitive interface
- ⚡ Fast and accurate calculations
- 🎯 Simple, focused design with no unnecessary clutter
- 💰 Free app with minimal ads that don't interfere
- 🔧 Requires only two values to calculate the rest

**What reviewers complain about**

- 🐛 Crashes when entering decimal values in multiple fields
- 🐛 Reset function doesn't work properly after first use
- ⚠️ App incompatible with newer iOS versions
- ⚠️ Outdated and hasn't been updated since iOS 6
- ❌ Limited functionality - single resistor only

**Reported bugs**

- App crashes when entering decimal points in multiple fields simultaneously
- Reset button fails to clear values after first use
- Large calculations cause app to crash
- Crashes on iPhone SE and iPhone 7 Plus with iOS 10+
- App won't open or frequently crashes on some devices

**Requested features**

- AC/DC checkbox option
- Three-phase power calculations
- Parallel and combination circuit support
- Impedance and reactance calculations
- Ohm's Wheel reference tool


### 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


## Frequently asked questions

### Is Ohm's Law free?

Ohm's Law is free to download, with in-app purchases available.

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

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

### Which has better reviews, Ohm's Law or Mike Holt's Electrical Toolbox?

Ohm's Law is rated higher. Ohm's Law averages 4.7 out of 5 from 172 ratings, while Mike Holt's Electrical Toolbox averages 4.6 from 198 ratings.

### Do Ohm's Law or Mike Holt's Electrical Toolbox have ads?

Neither Ohm's Law nor Mike Holt's Electrical Toolbox shows ads.

### Which is updated more often, Ohm's Law or Mike Holt's Electrical Toolbox?

Ohm's Law ships an update every 4 months, and Mike Holt's Electrical Toolbox every 3 months. Most recently, Ohm's Law was updated on November 6, 2026 and Mike Holt's Electrical Toolbox on November 6, 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.*