Mike Holt's Electrical Toolbox vs Building Wire Selector
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
Read full descriptionHide 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.
Building Wire Selector
This tool helps determine the correct conductor size and wire type for electrical installations. It adheres to the National Electrical Code® wiring methods, ensuring compliance and safety.
- Conductor size determination
- Wire and cable type selection
- National Electrical Code compliance
- Electrical installation guidance
Read full descriptionHide full description
Southwire's Building Wire Selector determines the minimum conductor size and the best wire and cable type for a particular installation, following the National Electrical Code® wiring methods.
Screenshots
Verdict
The clearest difference is rating: Building Wire Selector at 5.0 against Mike Holt's Electrical Toolbox's 4.6. Building Wire Selector also leads on review sentiment (100% vs 77%). Mike Holt's Electrical Toolbox's advantage is ratings volume (197 vs 2) and iOS requirement (14.0 vs 16.6). 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.
Building Wire Selector holds the better App Store score, 5.0 against 4.6. 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 100% of Building Wire Selector's.
Mike Holt's Electrical Toolbox ships an update every 3 months, Building Wire Selector every 2 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.
| Parameter | Mike Holt's Electrical Toolbox | Building Wire Selector |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (197 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 76.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 197 — better | 2 |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 26 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Mike Holt Enterprises | Southwire Company |
Customer experience
Mike Holt's Electrical Toolbox
Building Wire Selector
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 moreShow fewer
- Add more features, willing to pay extra
Building Wire Selector
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Mike Holt's Electrical Toolbox
No in-app purchases
Building Wire Selector
No in-app purchases
Questions
Is Mike Holt's Electrical Toolbox free?
Is Building Wire Selector free?
Which has better reviews, Mike Holt's Electrical Toolbox or Building Wire Selector?
Do Mike Holt's Electrical Toolbox or Building Wire Selector have ads?
Which is updated more often, Mike Holt's Electrical Toolbox or Building Wire Selector?
Other comparisons
