Mike Holt's Electrical Toolbox vs TD Drive Tool
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.
TD Drive Tool
This application offers an advanced interface for managing TD series drive systems. It enables users to read and modify system configurations, perform commissioning, and access diagnostic and real-time data for troubleshooting. Users can also generate system reports.
- Advanced user interface for TD series drives
- Read and modify drive system configuration
- Perform drive commissioning
- Read diagnostic and real-time data
- Troubleshoot the system
- Send system reports
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TD Drive Tool app provides an advanced user interface for TD series drive system. It allows the user to read and modify the drive system configuration and perform commissioning of the drive. With the app, the user can read diagnostic and real time data, troubleshoot the system and send system report.
Screenshots
Verdict
The clearest difference is review sentiment: Mike Holt's Electrical Toolbox at 77% against TD Drive Tool's 0%. Mike Holt's Electrical Toolbox also leads on rating (4.6 vs 3.0) and ratings volume (197 vs 2). On price, update cadence, ads and in-app purchases 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 holds the better App Store score, 4.6 against 3.0. That said, the two scores are not equally well evidenced: Mike Holt's Electrical Toolbox has 197 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 77% of Mike Holt's Electrical Toolbox's written reviews are positive against 0% of TD Drive Tool's.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.
| Parameter | Mike Holt's Electrical Toolbox | TD Drive Tool |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (197 ratings) — better | 3.0 (2 ratings) |
| Positive reviews | 76.7% of reviews — better | 0.0% of reviews |
| Number of ratings | 197 — better | 2 |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 14.0 | 14.0 |
| Further details — not scored | ||
| Size | 26 MB | 28 MB |
| Age rating | 4+ | 4+ |
| Developer | Mike Holt Enterprises | Delta Electronics, Inc. |
Customer experience
Mike Holt's Electrical Toolbox
TD Drive Tool
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
TD Drive Tool
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Mike Holt's Electrical Toolbox
No in-app purchases
TD Drive Tool
No in-app purchases
Questions
Is Mike Holt's Electrical Toolbox free?
Is TD Drive Tool free?
Which has better reviews, Mike Holt's Electrical Toolbox or TD Drive Tool?
Do Mike Holt's Electrical Toolbox or TD Drive Tool have ads?
Which is updated more often, Mike Holt's Electrical Toolbox or TD Drive Tool?
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