# Voltage Drop Calculator. vs Concentric Neutral Calculator

The clearest difference is in-app purchases: Concentric Neutral Calculator at none against Voltage Drop Calculator.'s 1. Concentric Neutral Calculator also leads on ads (none vs shown). Voltage Drop Calculator.'s advantage is update cadence (every 3 months vs every 7 months). On price, 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. Concentric Neutral Calculator asks for nothing beyond the download.

Voltage Drop Calculator. ships an update every 3 months, Concentric Neutral Calculator every 7 months. The most recent releases landed on November 9, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Voltage Drop Calculator. | Concentric Neutral Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (414 ratings)](https://appshunter.io/ios/app/voltage-drop-calculator/id1203737064/reviews)** | — |
| Number of ratings | **414** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 months** | Every 7 months |
| Monetization | Free with in-app purchases | — |
| Size | 51 MB | 5 MB |
| Requires iOS | 17.6 | **16.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [Southwire Company](https://appshunter.io/developer/440338423) |

## What reviewers say

### 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 |


### Concentric Neutral Calculator

[App page](https://appshunter.io/ios/app/concentric-neutral-calculator/id6478878772)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Voltage Drop Calculator. free?

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

### Is Concentric Neutral Calculator free?

Concentric Neutral Calculator is free to download, with no in-app purchases.

### Do Voltage Drop Calculator. or Concentric Neutral Calculator have ads?

Voltage Drop Calculator. shows ads; Concentric Neutral Calculator does not.

### Which is updated more often, Voltage Drop Calculator. or Concentric Neutral Calculator?

Voltage Drop Calculator. ships an update every 3 months, and Concentric Neutral Calculator every 7 months. Most recently, Voltage Drop Calculator. was updated on November 9, 2026 and Concentric Neutral Calculator on October 6, 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.*