Provolt Room Controller vs Mike Holt's Electrical Toolbox
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Provolt Room Controller
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The smart way to commission lighting controls! Configure daylight harvesting levels, occupant sensor range and sensitivity, vacancy timeouts, partial on/off levels, and demand response action all with your Bluetooth mobile device.
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.
Screenshots
Verdict
The clearest difference is iOS requirement: Provolt Room Controller at 8.0 against Mike Holt's Electrical Toolbox's 14.0. 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.
Provolt Room Controller ships an update every 4 months, Mike Holt's Electrical Toolbox every 3 months. The most recent releases landed on October 6, 2026 and October 16, 2026 respectively.
| Parameter | Provolt Room Controller | Mike Holt's Electrical Toolbox |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.6 (197 ratings) — better |
| Positive reviews | — | 76.7% of reviews |
| Number of ratings | — | 197 — better |
| Update frequency | Every 4 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 4 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | Leviton Manufacturing Co. Inc. | Mike Holt Enterprises |
Bugs and requests
Provolt Room Controller
Not enough reviews yet to summarise bugs or 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
In-app purchases
Provolt Room Controller
No in-app purchases
Mike Holt's Electrical Toolbox
No in-app purchases
Questions
Is Provolt Room Controller free?
Is Mike Holt's Electrical Toolbox free?
Do Provolt Room Controller or Mike Holt's Electrical Toolbox have ads?
Which is updated more often, Provolt Room Controller or Mike Holt's Electrical Toolbox?
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