Mike Holt's Electrical Toolbox vs SDL Field
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.
SDL Field
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Perform Municipal Inspections in the Field — Fast, Accurate, and Mobile SDL Field is designed for municipal inspectors who need to access and manage inspections directly from the field. Whether you’re working in construction, fire prevention, code enforcement, or public works, SDL Field helps streamline your workflow and keep your municipality connected. With SDL Field on your iPhone or iPad, you can: - View, edit, and submit inspection reports from anywhere - Take photos in the field and attach them to reports - Access and fill out checklists, forms, and documents - Work offline and sync your data when back online - Search for properties and inspections with map-based tools - Use location services to find nearby work sites SDL Field is used by municipalities across the country. If your town is not yet using SDL Field, you can visit getsdl.com to learn how to join the platform.
Screenshots
Verdict
The clearest difference is update cadence: SDL Field at every 3 weeks against Mike Holt's Electrical Toolbox's every 3 months. 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, SDL Field every 3 weeks. The most recent releases landed on November 6, 2026 and November 8, 2026 respectively.
| Parameter | Mike Holt's Electrical Toolbox | SDL Field |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (198 ratings) — better | — |
| Positive reviews | 76.7% of reviews | — |
| Number of ratings | 198 — better | — |
| Update frequency | Every 3 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 26 MB | 56 MB |
| Age rating | 4+ | 4+ |
| Developer | Mike Holt Enterprises | Spatial Data Logic 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
SDL Field
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Mike Holt's Electrical Toolbox
No in-app purchases
SDL Field
No in-app purchases
Questions
Is Mike Holt's Electrical Toolbox free?
Is SDL Field free?
Do Mike Holt's Electrical Toolbox or SDL Field have ads?
Which is updated more often, Mike Holt's Electrical Toolbox or SDL Field?
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