Mike Holt's Electrical Toolbox vs Lumen Layout
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.
Lumen Layout
This app helps calculate pot light layouts for rooms. It offers basic and advanced modes for quick or precise planning, providing coordinates and diagrams for each light. Streamline your lighting design process with this user-friendly tool.
- Pot light layout calculation
- Basic and advanced modes
- Customizable room dimensions
- Light spacing options
- Individual light coordinates
- Diagrammatic reference
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Introducing Lumen Layout - your new pot light layout calculator. Offering simplicity, flexibility and a beautiful design for a reasonable price. Choose between basic and advanced modes to get the layout you need - fast. Here's the difference: Basic is quick and simple - add room dimensions, choose your layout and specify the number of lights. Advanced offers more precision - specify width and length for room dimensions, number of lights and spacing style to get the most customizable layout possible. Both options end in the same place: a simple and easy to understand results page where each individual light's coordinates are presented in a list with the light spacing and a diagram to reference. Get Lumen Layout today and let us help speed up that tedious layout process!
Screenshots
Verdict
The clearest difference is price: Mike Holt's Electrical Toolbox at Free against Lumen Layout's $4.99. Mike Holt's Electrical Toolbox also leads on rating (4.6 vs 1.0) and review sentiment (77% vs 50%). On 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
Mike Holt's Electrical Toolbox is free to download; Lumen Layout costs $4.99 up front. 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 1.0. That said, the two scores are not equally well evidenced: Mike Holt's Electrical Toolbox has 198 ratings behind it against 1, 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 50% of Lumen Layout's.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on November 6, 2026 and November 5, 2026 respectively.
| Parameter | Mike Holt's Electrical Toolbox | Lumen Layout |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | 4.6 (198 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 76.7% of reviews — better | 50.0% of reviews |
| Number of ratings | 198 — better | 1 |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 14.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 26 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Mike Holt Enterprises | The Sparky |
Customer experience
Mike Holt's Electrical Toolbox
Lumen Layout
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
Lumen Layout
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Mike Holt's Electrical Toolbox
No in-app purchases
Lumen Layout
No in-app purchases
Questions
Is Mike Holt's Electrical Toolbox free?
Is Lumen Layout free?
Which has better reviews, Mike Holt's Electrical Toolbox or Lumen Layout?
Do Mike Holt's Electrical Toolbox or Lumen Layout have ads?
Which is updated more often, Mike Holt's Electrical Toolbox or Lumen Layout?
Other comparisons
