Comparison

Mike Holt's Electrical Toolbox vs PLC Tools Plus

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

PLC Tools Plus

Features
Read full description

PLC Tools Plus turns your phone or tablet into a portable EtherNet/IP diagnostic tool for compatible PLC controllers. Discover controllers on your local network, explore their full tag database, and watch live values update in real time - all without opening a laptop or launching programming software. Built for controls engineers, technicians, and integrators who need a fast way to check on a machine from the plant floor. KEY FEATURES - Controller Discovery: Scan your local network for EtherNet/IP controllers, or connect directly by IP address. Choose which network interface to scan from when your device has more than one. - Full Tag Browser: Explore a controller's complete tag database, including nested structures, arrays, and user-defined types (UDTs). Drill down into individual members to find exactly the tag you need. - Live Data Monitor: Add tags to a live monitoring view grouped by controller, watch values update in real time, and write new values to tags when you need to test or adjust a running process. - Ethernet/IP IO Scanner: Connect to any IO device that supports Ethernet/IP such field IO and VFDs - Ethernet/IP IO Device Simulator: Simulate IO devices and connect to it from a PLC. Simulate input data and read output data. - Demo PLC Mode: New to the app? Try a simulated "Demo PLC" controller loaded with sample tags, arrays, and UDTs - no real hardware required. - Built for the Field: A clean, mobile-first interface designed for quick checks on the plant floor, not a scaled-down desktop tool. REQUIREMENTS - Your device must be on the same local network as the target PLC(s). - Compatible with PLC controllers that support the EtherNet/IP (CIP) protocol using symbolic tag names. SUBSCRIPTION PLC Tools Plus includes a 14-day free trial. After the trial, full access requires a PLC Tools Plus Pro subscription at $4.99/month. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. Manage or cancel your subscription anytime in your App Store account settings. Payment will be charged to your Apple ID account at confirmation of purchase. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://serafintech.github.io/privacy/plc-tools-plus/

Screenshots

Mike Holt's Electrical Toolbox4 screens
PLC Tools Plus3 screens

Verdict

The call

The clearest difference is in-app purchases: Mike Holt's Electrical Toolbox at none against PLC Tools Plus's 1. Mike Holt's Electrical Toolbox also leads on iOS requirement (14.0 vs 16.4). PLC Tools Plus's advantage is update cadence (every 5 days vs every 3 months). On price, ads 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. PLC Tools Plus sells 1 in-app purchase, starting at $4.99 per month. Mike Holt's Electrical Toolbox asks for nothing beyond the download.

UpkeepUpdate frequency

Mike Holt's Electrical Toolbox ships an update every 3 months, PLC Tools Plus every 5 days. The most recent releases landed on October 16, 2026 and October 14, 2026 respectively.

Scorecard3 real differences · 7 level
Mike Holt's Electrical Toolbox versus PLC Tools Plus: the parameters behind the verdict, then further details
ParameterMike Holt's Electrical ToolboxPLC Tools Plus
PriceFreeFree
Rating4.6 (197 ratings) — better—
Positive reviews76.7% of reviews—
Number of ratings197 — better—
Update frequencyEvery 3 monthsEvery 5 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS14.0 — better16.4
Further details — not scored
Size26 MB60 MB
Age rating4+4+
DeveloperMike Holt EnterprisesJASON THOMAS SERAFIN

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

PLC Tools Plus

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Mike Holt's Electrical Toolbox

No in-app purchases

1 purchases

PLC Tools Plus

Subscriptions1
  • PLC Tools Plus Pro14 Days trial$4.991 Month

Questions

Is Mike Holt's Electrical Toolbox free?
Mike Holt's Electrical Toolbox is free to download, with no in-app purchases.
Is PLC Tools Plus free?
PLC Tools Plus is free to download, with in-app purchases available.
Do Mike Holt's Electrical Toolbox or PLC Tools Plus have ads?
Neither Mike Holt's Electrical Toolbox nor PLC Tools Plus shows ads.
Which is updated more often, Mike Holt's Electrical Toolbox or PLC Tools Plus?
Mike Holt's Electrical Toolbox ships an update every 3 months, and PLC Tools Plus every 5 days. Most recently, Mike Holt's Electrical Toolbox was updated on October 16, 2026 and PLC Tools Plus on October 14, 2026.

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