Comparison

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.

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

NEMA Guide

Features
Read full description

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

Mike Holt's Electrical Toolbox4 screens
NEMA Guide4 screens

Verdict

The call

The clearest difference is update cadence: NEMA Guide at every 2 days against Mike Holt's Electrical Toolbox's every 3 months. Mike Holt's Electrical Toolbox's advantage is iOS requirement (14.0 vs 17.6). 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, NEMA Guide every 2 days. The most recent releases landed on September 21, 2026 and September 12, 2026 respectively.

Scorecard2 real differences · 8 level
Mike Holt's Electrical Toolbox versus NEMA Guide: the parameters behind the verdict, then further details
ParameterMike Holt's Electrical ToolboxNEMA Guide
PriceFreeFree
Rating4.6 (197 ratings) — better—
Positive reviews76.7% of reviews—
Number of ratings197 — better—
Update frequencyEvery 3 monthsEvery 2 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS14.0 — better17.6
Further details — not scored
Size26 MB23 MB
Age rating4+4+
DeveloperMike Holt EnterprisesRed 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
Show 1 more
  • Add more features, willing to pay extra

NEMA Guide

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Mike Holt's Electrical Toolbox

No in-app purchases

None

NEMA Guide

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 NEMA Guide free?
NEMA Guide is free to download, with no in-app purchases.
Do Mike Holt's Electrical Toolbox or NEMA Guide have ads?
Neither Mike Holt's Electrical Toolbox nor NEMA Guide shows ads.
Which is updated more often, Mike Holt's Electrical Toolbox or NEMA Guide?
Mike Holt's Electrical Toolbox ships an update every 3 months, and NEMA Guide every 2 days. Most recently, Mike Holt's Electrical Toolbox was updated on September 21, 2026 and NEMA Guide on September 12, 2026.

Other comparisons