Mike Holt's Electrical Toolbox vs NEMA Guide
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
NEMA Guide
Quickly identify and cross-reference NEMA plug and receptacle configurations with detailed illustrations and specifications. This tool streamlines the process for electricians and electrical professionals by allowing searches by NEMA number or filtering by various electrical parameters.
- Identify NEMA plug and receptacle configurations
- Search by NEMA number
- Filter by voltage, amperage, phase, poles, wires, and grounding
- View matching configurations instantly
- Over 170 configuration illustrations
- Detailed specifications for each configuration
- Offline data storage
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Use the NEMA Guide app to quickly identify and cross-reference NEMA plug and receptacle configurations—a must-have tool for electricians and electrical professionals on the job. Whether you're trying to identify an unknown plug or need to confirm the right receptacle for a specific application, this app streamlines the process. Simply search by NEMA number or filter by voltage, amperage, phase, poles, wires, and grounding type to view all matching results. With illustrations and detailed specs for each configuration, to save you time and avoid guesswork on-site. Features: - Search by NEMA configuration number. - Filter by voltage, amperage, phase, poles, wires, and grounding. - Instantly view matching plug and receptacle configurations. - Over 170 high-quality configuration illustrations. - Tap to view detailed specs for each configuration. - Cross-reference plugs and receptacles with ease. - Data is stored locally for quick use in the field or on the job-site.
Screenshots
Verdict
The clearest difference is update cadence: NEMA Guide at every 2 days against Mike Holt's Electrical Toolbox's every 3 months. NEMA Guide also leads on rating (5.0 vs 4.6). Mike Holt's Electrical Toolbox's advantage is ratings volume (197 vs 1) and iOS requirement (14.0 vs 17.6). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.
NEMA Guide holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Mike Holt's Electrical Toolbox has 197 ratings behind it against 1, so its average is the more settled of the two.
Mike Holt's Electrical Toolbox ships an update every 3 months, NEMA Guide every 2 days. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.
| Parameter | Mike Holt's Electrical Toolbox | NEMA Guide |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (197 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 76.7% of reviews | — |
| Number of ratings | 197 — better | 1 |
| Update frequency | Every 3 months | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 26 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | Mike Holt Enterprises | Red Zepp LLC |
Bugs and requests
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
NEMA Guide
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Mike Holt's Electrical Toolbox
No in-app purchases
NEMA Guide
No in-app purchases
Questions
Is Mike Holt's Electrical Toolbox free?
Is NEMA Guide free?
Which has better reviews, Mike Holt's Electrical Toolbox or NEMA Guide?
Do Mike Holt's Electrical Toolbox or NEMA Guide have ads?
Which is updated more often, Mike Holt's Electrical Toolbox or NEMA Guide?
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