Comparison

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.

Head to head
About

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.

Highlights
  • Conductor sizing
  • Voltage drop limitations
  • Circuit protection sizing
  • Race sizing
  • Equipment grounding conductor sizing
  • Dwelling-unit service calculations
Features
Read full description

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.

About

SDL Field

Features
Read full description

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

Mike Holt's Electrical Toolbox4 screens
SDL Field4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

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.

Scorecard1 real difference · 9 level
Mike Holt's Electrical Toolbox versus SDL Field: the parameters behind the verdict, then further details
ParameterMike Holt's Electrical ToolboxSDL Field
PriceFreeFree
Rating4.6 (198 ratings) — better—
Positive reviews76.7% of reviews—
Number of ratings198 — better—
Update frequencyEvery 3 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.0 — better15.1
Further details — not scored
Size26 MB56 MB
Age rating4+4+
DeveloperMike Holt EnterprisesSpatial 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
Show 1 more
  • Add more features, willing to pay extra

SDL Field

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Mike Holt's Electrical Toolbox

No in-app purchases

None

SDL Field

No in-app purchases

Questions

Is Mike Holt's Electrical Toolbox free?
Mike Holt's Electrical Toolbox is free to download, with no in-app purchases.
Is SDL Field free?
SDL Field is free to download, with no in-app purchases.
Do Mike Holt's Electrical Toolbox or SDL Field have ads?
Neither Mike Holt's Electrical Toolbox nor SDL Field shows ads.
Which is updated more often, Mike Holt's Electrical Toolbox or SDL Field?
Mike Holt's Electrical Toolbox ships an update every 3 months, and SDL Field every 3 weeks. Most recently, Mike Holt's Electrical Toolbox was updated on November 6, 2026 and SDL Field on November 8, 2026.

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