SCR MAXFLO™ vs Mike Holt's Electrical Toolbox
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SCR MAXFLO™
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.
- 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
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The SCR MAXFLO™ App calculates pressure drop, fluid velocity, Reynold’s number, and friction factor for both liquid and gas. Other features include the ability to create custom projects as well as the ability to add and edit pipes, fluids, and fittings. Need to work in metric and imperial units? The SCR MAXFLO™ App has you covered. From changing pipe size on the fly to sharing your calculations with other users, the SCR MAXFLO™ App can help you work quickly and efficiently on any job site.
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 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.
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.
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.
| Parameter | SCR MAXFLO™ | Mike Holt's Electrical Toolbox |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (5 ratings) | 4.6 (197 ratings) — better |
| Positive reviews | — | 76.7% of reviews |
| Number of ratings | 5 | 197 — better |
| Update frequency | Every 11 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.6 | 14.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | Southwire Company | Mike Holt Enterprises |
Customer experience
SCR MAXFLO™
Mike Holt's Electrical Toolbox
Bugs and requests
SCR MAXFLO™
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
SCR MAXFLO™
No in-app purchases
Mike Holt's Electrical Toolbox
No in-app purchases
Questions
Is SCR MAXFLO™ free?
Is Mike Holt's Electrical Toolbox free?
Which has better reviews, SCR MAXFLO™ or Mike Holt's Electrical Toolbox?
Do SCR MAXFLO™ or Mike Holt's Electrical Toolbox have ads?
Which is updated more often, SCR MAXFLO™ or Mike Holt's Electrical Toolbox?
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