# Southwire® Voltage Drop Calc vs VDrop

The clearest difference is review sentiment: VDrop at 100% against Southwire® Voltage Drop Calc's 48%. VDrop also leads on rating (5.0 vs 4.6) and iOS requirement (10.0 vs 15.0). Southwire® Voltage Drop Calc's advantage is update cadence (every 2 months vs every 13 months) and ratings volume (1.5K vs 3). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

VDrop holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Southwire® Voltage Drop Calc has 1.5K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 48% of Southwire® Voltage Drop Calc's written reviews are positive against 100% of VDrop's.

Southwire® Voltage Drop Calc ships an update every 2 months, VDrop every 13 months. The most recent releases landed on September 17, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | Southwire® Voltage Drop Calc | VDrop |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (1.5K ratings)](https://appshunter.io/ios/app/southwire-voltage-drop-calc/id440338420/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/vdrop/id1461666751/reviews)** |
| Number of ratings | **1.5K** | 3 |
| Positive reviews | 48.1% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 13 months |
| Monetization | Free | Free |
| Size | 10 MB | 13 MB |
| Requires iOS | 15.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Southwire Company](https://appshunter.io/developer/440338423) | [Nebulous LLC](https://appshunter.io/developer/1448637140) |

## What reviewers say

### Southwire® Voltage Drop Calc

[App page](https://appshunter.io/ios/app/southwire-voltage-drop-calc/id440338420)

Calculate the appropriate wire size for electrical circuits. This tool helps determine wire size based on voltage drop and current carrying capacity, ensuring compliance with NEC ampacity limits.

**Highlights:** Determine wire size for voltage drop, Calculate voltage drop for conductor runs, Limit wire size by voltage drop, Limit wire size by NEC ampacity, Supports AWG and KCMIL sizes

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 🚀 Quick and useful
- 🚀 Great Quick Reference
- 👍 A must have app for electricians
- 👍 Love These
- 👍 Electrical Engineer

**What reviewers complain about**

- 🐛 Motor starting Voltage drop
- 🐛 Useless!
- 🐛 Won't work
- 🐛 How to use
- 🐛 Confused

**Reported bugs**

- Useless!
- Won't work
- How to use
- Confused
- Bad app

**Requested features**

- Motor starting Voltage drop calculation
- Metric wire size options


### VDrop

[App page](https://appshunter.io/ios/app/vdrop/id1461666751)

This utility calculates voltage drop for electrical systems up to 600V. It provides detailed calculation outputs to help users verify results and build confidence in their electrical work. Custom voltage inputs are supported.

**Highlights:** Voltage drop calculations, Supports up to 600V, Custom voltage input, Detailed calculation outputs, User confidence building

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Southwire® Voltage Drop Calc free?

Southwire® Voltage Drop Calc is free to download, with no in-app purchases.

### Is VDrop free?

VDrop is free to download, with no in-app purchases.

### Which has better reviews, Southwire® Voltage Drop Calc or VDrop?

VDrop is rated higher. Southwire® Voltage Drop Calc averages 4.6 out of 5 from 1.5K ratings, while VDrop averages 5.0 from 3 ratings.

### Do Southwire® Voltage Drop Calc or VDrop have ads?

Neither Southwire® Voltage Drop Calc nor VDrop shows ads.

### Which is updated more often, Southwire® Voltage Drop Calc or VDrop?

Southwire® Voltage Drop Calc ships an update every 2 months, and VDrop every 13 months. Most recently, Southwire® Voltage Drop Calc was updated on September 17, 2026 and VDrop on June 1, 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.*