Mike Holt's Electrical Toolbox vs Generac Field Pro
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.
Generac Field Pro
Streamline the installation, servicing, and registration of energy systems. Features guided workflows, smart firmware updates, and comprehensive diagnostics for efficient system management.
- Guided commissioning workflow
- Smart firmware updates
- Full system testing
- Product diagnostics
- In-app activation and registration
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Commission and service Generac energy systems fast. One app for guided installs, system tests, diagnostics, and instant registration across compatible platforms. In the app, installers will find: Guided Commissioning Workflow: Step-by-step commissioning ensures smooth onboarding and streamlined commissioning across all compatible systems. Smart Firmware Updates: Apply fast firmware updates directly from Field Pro and reduce total installation time. Full System Testing: Verify system health and performance with a full suite of validation tools. Product Diagnostics: Troubleshoot with confidence, with full system performance and health information. In-app Activation: Finalize installation with a few taps—register warranty and activate products seamlessly from your device.
Screenshots
Verdict
The clearest difference is review sentiment: Mike Holt's Electrical Toolbox at 77% against Generac Field Pro's 20%. Mike Holt's Electrical Toolbox also leads on rating (4.6 vs 2.9) and ratings volume (197 vs 28). Generac Field Pro's advantage is update cadence (fortnightly vs every 3 months). 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.
Mike Holt's Electrical Toolbox holds the better App Store score, 4.6 against 2.9. That said, the two scores are not equally well evidenced: Mike Holt's Electrical Toolbox has 197 ratings behind it against 28, so its average is the more settled of the two. Written reviews point the same way: 77% of Mike Holt's Electrical Toolbox's written reviews are positive against 20% of Generac Field Pro's.
Mike Holt's Electrical Toolbox ships an update every 3 months, Generac Field Pro fortnightly. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.
| Parameter | Mike Holt's Electrical Toolbox | Generac Field Pro |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (197 ratings) — better | 2.9 (28 ratings) |
| Positive reviews | 76.7% of reviews — better | 20.0% of reviews |
| Number of ratings | 197 — better | 28 |
| Update frequency | Every 3 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 26 MB | 75 MB |
| Age rating | 4+ | 4+ |
| Developer | Mike Holt Enterprises | Generac Power Systems, Inc. |
Customer experience
Mike Holt's Electrical Toolbox
Generac Field Pro
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
Generac Field Pro
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Mike Holt's Electrical Toolbox
No in-app purchases
Generac Field Pro
No in-app purchases
Questions
Is Mike Holt's Electrical Toolbox free?
Is Generac Field Pro free?
Which has better reviews, Mike Holt's Electrical Toolbox or Generac Field Pro?
Do Mike Holt's Electrical Toolbox or Generac Field Pro have ads?
Which is updated more often, Mike Holt's Electrical Toolbox or Generac Field Pro?
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