Mike Holt's Electrical Toolbox vs 9011B
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.
9011B
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The Jenco 9011B app connects via Bluetooth with Jenco’s latest professional portable DO/temperature meter to enable additional data storage and data sharing functionality. * Easily pair the iPhone with Jenco models 9011B professional DO/temperature portable meters. * Keep your iPhone in your pocket while out in the field. Data from connected meter is saved in the app. * Share saved data with other apps for reporting or further analysis.
Screenshots
Verdict
The clearest difference is update cadence: Mike Holt's Electrical Toolbox at every 3 months against 9011B's every 12 months. 9011B's advantage is iOS requirement (9.0 vs 14.0). On price, ads, in-app purchases and device support 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.
Mike Holt's Electrical Toolbox ships an update every 3 months, 9011B every 12 months. The most recent releases landed on October 21, 2026 and October 8, 2026 respectively.
| Parameter | Mike Holt's Electrical Toolbox | 9011B |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (196 ratings) — better | — |
| Positive reviews | 76.7% of reviews | — |
| Number of ratings | 196 — better | — |
| Update frequency | Every 3 months — better | Every 12 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 | 9.0 — better |
| Further details — not scored | ||
| Size | 26 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | Mike Holt Enterprises | Jenco Instruments, Inc. |
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
9011B
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Mike Holt's Electrical Toolbox
No in-app purchases
9011B
No in-app purchases
Questions
Is Mike Holt's Electrical Toolbox free?
Is 9011B free?
Do Mike Holt's Electrical Toolbox or 9011B have ads?
Which is updated more often, Mike Holt's Electrical Toolbox or 9011B?
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