# SCR MAXFLO™ vs Mike Holt's Electrical Toolbox

The clearest difference is ratings volume: Mike Holt's Electrical Toolbox at 197 against SCR MAXFLO™'s 5. Mike Holt's Electrical Toolbox also leads on update cadence (every 3 months vs every 11 months) and device support (3 vs 1). On price, rating, 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.

On the App Store both sit at effectively the same score — 4.6 for SCR MAXFLO™ against 4.6 for Mike Holt's Electrical Toolbox. That said, the two scores are not equally well evidenced: Mike Holt's Electrical Toolbox has 197 ratings behind it against 5, so its average is the more settled of the two.

SCR MAXFLO™ ships an update every 11 months, Mike Holt's Electrical Toolbox every 3 months. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | SCR MAXFLO™ | Mike Holt's Electrical Toolbox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (5 ratings)](https://appshunter.io/ios/app/scr-maxflo/id1077499630/reviews) | **[4.6 (197 ratings)](https://appshunter.io/ios/app/mike-holts-electrical-toolbox/id1406630647/reviews)** |
| Number of ratings | 5 | **197** |
| Positive reviews | — | 76.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 7 MB | 26 MB |
| Requires iOS | 16.6 | **14.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Southwire Company](https://appshunter.io/developer/440338423) | [Mike Holt Enterprises](https://appshunter.io/developer/1349960186) |

## What reviewers say

### SCR MAXFLO™

[App page](https://appshunter.io/ios/app/scr-maxflo/id1077499630)

This app calculates pressure drop, fluid velocity, Reynold's number, and friction factor for liquids and gases. It allows users to create custom projects, manage pipes, fluids, and fittings, and supports both metric and imperial units for efficient on-site work.

**Highlights:** Pressure drop calculation, Fluid velocity calculation, Reynold's number calculation, Friction factor calculation, Custom project creation, Pipe, fluid, and fitting management, Metric and imperial unit support

**Features:** macOS Compatibility

**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 SCR MAXFLO™ free?

SCR MAXFLO™ 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.

### Which has better reviews, SCR MAXFLO™ or Mike Holt's Electrical Toolbox?

Mike Holt's Electrical Toolbox is rated higher. SCR MAXFLO™ averages 4.6 out of 5 from 5 ratings, while Mike Holt's Electrical Toolbox averages 4.6 from 197 ratings.

### Do SCR MAXFLO™ or Mike Holt's Electrical Toolbox have ads?

Neither SCR MAXFLO™ nor Mike Holt's Electrical Toolbox shows ads.

### Which is updated more often, SCR MAXFLO™ or Mike Holt's Electrical Toolbox?

SCR MAXFLO™ ships an update every 11 months, and Mike Holt's Electrical Toolbox every 3 months. Most recently, SCR MAXFLO™ was updated on October 24, 2026 and Mike Holt's Electrical Toolbox on October 26, 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.*