# SCR MAXFLO™ vs Voltage Drop Calculator.

The clearest difference is in-app purchases: SCR MAXFLO™ at none against Voltage Drop Calculator.'s 1. SCR MAXFLO™ also leads on ads (none vs shown). Voltage Drop Calculator.'s advantage is ratings volume (413 vs 5) and update cadence (every 3 months vs every 11 months). On price, rating, device support and iOS requirement there is nothing between them.

Both are free to download. Voltage Drop Calculator. sells 1 one-off in-app purchase. SCR MAXFLO™ asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.6 for SCR MAXFLO™ against 4.6 for Voltage Drop Calculator.. That said, the two scores are not equally well evidenced: Voltage Drop Calculator. has 413 ratings behind it against 5, so its average is the more settled of the two.

SCR MAXFLO™ ships an update every 11 months, Voltage Drop Calculator. every 3 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | SCR MAXFLO™ | Voltage Drop Calculator. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (5 ratings)](https://appshunter.io/ios/app/scr-maxflo/id1077499630/reviews) | **[4.6 (413 ratings)](https://appshunter.io/ios/app/voltage-drop-calculator/id1203737064/reviews)** |
| Number of ratings | 5 | **413** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 11 months | **Every 3 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 7 MB | 51 MB |
| Requires iOS | **16.6** | 17.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Southwire Company](https://appshunter.io/developer/440338423) | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) |

## 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


### Voltage Drop Calculator.

[App page](https://appshunter.io/ios/app/voltage-drop-calculator/id1203737064)

Calculate voltage drop and wire size using both NEC and IEC standards. Supports various load types, conductor materials, and system configurations. Generates detailed reports for electricians, engineers, and contractors.

**Highlights:** NEC and IEC dual standards, Voltage drop and wire sizing calculations, Support for continuous load and corrections, Copper or Aluminum conductor options, Single-phase and three-phase systems, Automatic compliance checks, PDF report generation

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Go Pro | $4.99 | one-time |


## Frequently asked questions

### Is SCR MAXFLO™ free?

SCR MAXFLO™ is free to download, with no in-app purchases.

### Is Voltage Drop Calculator. free?

Voltage Drop Calculator. is free to download, with in-app purchases available.

### Which has better reviews, SCR MAXFLO™ or Voltage Drop Calculator.?

Voltage Drop Calculator. is rated higher. SCR MAXFLO™ averages 4.6 out of 5 from 5 ratings, while Voltage Drop Calculator. averages 4.6 from 413 ratings.

### Do SCR MAXFLO™ or Voltage Drop Calculator. have ads?

Voltage Drop Calculator. shows ads; SCR MAXFLO™ does not.

### Which is updated more often, SCR MAXFLO™ or Voltage Drop Calculator.?

SCR MAXFLO™ ships an update every 11 months, and Voltage Drop Calculator. every 3 months. Most recently, SCR MAXFLO™ was updated on November 6, 2026 and Voltage Drop Calculator. on November 2, 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.*