# Provolt Room Controller vs Mike Holt's Electrical Toolbox

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.

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.

## The numbers

| Metric | Provolt Room Controller | Mike Holt's Electrical Toolbox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (197 ratings)](https://appshunter.io/ios/app/mike-holts-electrical-toolbox/id1406630647/reviews)** |
| Number of ratings | — | **197** |
| Positive reviews | — | 76.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | — | Free |
| Size | 4 MB | 26 MB |
| Requires iOS | **8.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Leviton Manufacturing Co. Inc.](https://appshunter.io/developer/877607790) | [Mike Holt Enterprises](https://appshunter.io/developer/1349960186) |

## What reviewers say

### Provolt Room Controller

[App page](https://appshunter.io/ios/app/provolt-room-controller/id1076989201)

**In-app purchases:** none


### Mike Holt's Electrical Toolbox

[App page](https://appshunter.io/ios/app/mike-holts-electrical-toolbox/id1406630647)

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.

**Highlights:** Conductor sizing, Voltage drop limitations, Circuit protection sizing, Race sizing, Equipment grounding conductor sizing, Dwelling-unit service calculations

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Great app for electricians
- 💡 Provides code article references
- 👍 Useful for on-the-spot reference
- 👍 Excellent for verifying calculations
- 👍 Helpful for exam preparation

**What reviewers complain about**

- 🐛 Emailing results not working
- 🐛 Outdated information
- 🐛 Load calc a little clunky
- 🐛 Content setup needs overhaul
- 🐛 Video series lacks completion system

**Reported bugs**

- Cannot email results
- Video player widescreen exit bug
- Previous calculation data not erased
- App content is outdated

**Requested features**

- 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


## Frequently asked questions

### Is Provolt Room Controller free?

Provolt Room Controller is free to download, with no in-app purchases.

### Is Mike Holt's Electrical Toolbox free?

Mike Holt's Electrical Toolbox is free to download, with no in-app purchases.

### Do Provolt Room Controller or Mike Holt's Electrical Toolbox have ads?

Neither Provolt Room Controller nor Mike Holt's Electrical Toolbox shows ads.

### Which is updated more often, Provolt Room Controller or Mike Holt's Electrical Toolbox?

Provolt Room Controller ships an update every 4 months, and Mike Holt's Electrical Toolbox every 3 months. Most recently, Provolt Room Controller was updated on October 6, 2026 and Mike Holt's Electrical Toolbox on October 16, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*