# Southwire® Voltage Drop Calc vs Kopperfield

The clearest difference is review sentiment: Southwire® Voltage Drop Calc at 49% against Kopperfield's 0%. Southwire® Voltage Drop Calc also leads on rating (4.6 vs 3.8) and ratings volume (1.5K vs 11). Kopperfield's advantage is update cadence (every 10 days vs every 2 months). 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.

Southwire® Voltage Drop Calc holds the better App Store score, 4.6 against 3.8. That said, the two scores are not equally well evidenced: Southwire® Voltage Drop Calc has 1.5K ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 49% of Southwire® Voltage Drop Calc's written reviews are positive against 0% of Kopperfield's.

Southwire® Voltage Drop Calc ships an update every 2 months, Kopperfield every 10 days. Both last shipped on October 30, 2026.

## The numbers

| Metric | Southwire® Voltage Drop Calc | Kopperfield |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (1.5K ratings)](https://appshunter.io/ios/app/southwire-voltage-drop-calc/id440338420/reviews)** | [3.8 (11 ratings)](https://appshunter.io/ios/app/kopperfield/id6736772332/reviews) |
| Number of ratings | **1.5K** | 11 |
| Positive reviews | **49.1% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | Free | Free |
| Size | 10 MB | 64 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Southwire Company](https://appshunter.io/developer/440338423) | [Kopperfield](https://appshunter.io/developer/1756157251) |

## 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


### Kopperfield

[App page](https://appshunter.io/ios/app/kopperfield/id6736772332)

Streamline electrical design and permit preparation with tools for load calculations, single-line diagrams, and panel schedules. Quickly reference the National Electrical Code with an AI-powered chatbot and generate PDF reports for inspectors.

**Highlights:** Load calculator with NEC standards, Single line diagram creation, Panel schedule generation, NEC chatbot, PDF report export, AI panel photo processing

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

**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 Kopperfield free?

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

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

Southwire® Voltage Drop Calc is rated higher. Southwire® Voltage Drop Calc averages 4.6 out of 5 from 1.5K ratings, while Kopperfield averages 3.8 from 11 ratings.

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

Neither Southwire® Voltage Drop Calc nor Kopperfield shows ads.

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

Southwire® Voltage Drop Calc ships an update every 2 months, and Kopperfield every 10 days. Most recently, Southwire® Voltage Drop Calc was updated on October 30, 2026 and Kopperfield on October 30, 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.*