Ohm's Law vs Mike Holt's Electrical Toolbox
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ohm's Law
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.
- Ohm's Law calculations
- Voltage calculation
- Current calculation
- Resistance calculation
- Electrical formula solver
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Ohm's Law Calculator
Mike Holt's Electrical Toolbox
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.
- Conductor sizing
- Voltage drop limitations
- Circuit protection sizing
- Race sizing
- Equipment grounding conductor sizing
- Dwelling-unit service calculations
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Mike Holt, the industry leader in the electrical industry (MikeHolt.com) has created an amazing, practical and useful app for the electrician, inspector, instructor, contractor and engineer. The app contains conductor sizing (including voltage drop limitations), circuit protection sizing, race sizing, equipment grounding conductor sizing for electric heating equipment (commercial and Residential), air-conditioning equipment (commercial and Residential), motors (commercial and Residential), Transformers (commercial) , and dwelling-unit service calculations and sizing.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Ohm's Law | Mike Holt's Electrical Toolbox |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (172 ratings) — better | 4.6 (198 ratings) |
| Positive reviews | 80.7% of reviews — better | 76.7% of reviews |
| Number of ratings | 172 | 198 — better |
| Update frequency | Every 4 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 9.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 9 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | Creature Code Mobile, LLC | Mike Holt Enterprises |
Customer experience
Ohm's Law
Mike Holt's Electrical Toolbox
User reviews
Ohm's Law
From 172 App Store ratingsWhat we love
- 👍 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
Room to improve
- 🐛 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
Mike Holt's Electrical Toolbox
From 198 App Store ratingsWhat we love
- 👍 Great app for electricians
- 💡 Provides code article references
- 👍 Useful for on-the-spot reference
- 👍 Excellent for verifying calculations
- 👍 Helpful for exam preparation
Room to improve
- 🐛 Emailing results not working
- 🐛 Outdated information
- 🐛 Load calc a little clunky
- 🐛 Content setup needs overhaul
- 🐛 Video series lacks completion system
Bugs and requests
Ohm's Law
Reported bugs
8 issues- 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
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- Crashes when entering ohms values
- Decimal point entry causes immediate crash on certain devices
- App unstable and incompatible with iOS 10 and later versions
Requested features
9 requests- AC/DC checkbox option
- Three-phase power calculations
- Parallel and combination circuit support
- Impedance and reactance calculations
- Ohm's Wheel reference tool
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- Useful electrical tables
- Example calculations showing work/formula
- Number pad input instead of full keyboard
- iOS compatibility updates for newer versions
Mike Holt's Electrical Toolbox
Reported bugs
4 issues- Cannot email results
- Video player widescreen exit bug
- Previous calculation data not erased
- App content is outdated
Requested features
6 requests- 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
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- Add more features, willing to pay extra
In-app purchases
Ohm's Law
- Remove Ads$0.99
Mike Holt's Electrical Toolbox
No in-app purchases
Questions
Is Ohm's Law free?
Is Mike Holt's Electrical Toolbox free?
Which has better reviews, Ohm's Law or Mike Holt's Electrical Toolbox?
Do Ohm's Law or Mike Holt's Electrical Toolbox have ads?
Which is updated more often, Ohm's Law or Mike Holt's Electrical Toolbox?
Other comparisons
