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.
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.
PLC Tools Plus
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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
Verdict
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
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.
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.
| Parameter | Mike Holt's Electrical Toolbox | PLC Tools Plus |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (197 ratings) — better | — |
| Positive reviews | 76.7% of reviews | — |
| Number of ratings | 197 — better | — |
| Update frequency | Every 3 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 26 MB | 60 MB |
| Age rating | 4+ | 4+ |
| Developer | Mike Holt Enterprises | JASON 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
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- Add more features, willing to pay extra
PLC Tools Plus
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Mike Holt's Electrical Toolbox
No in-app purchases
PLC Tools Plus
- PLC Tools Plus Pro14 Days trial$4.991 Month
Questions
Is Mike Holt's Electrical Toolbox free?
Is PLC Tools Plus free?
Do Mike Holt's Electrical Toolbox or PLC Tools Plus have ads?
Which is updated more often, Mike Holt's Electrical Toolbox or PLC Tools Plus?
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