# Southwire® Voltage Drop Calc vs Eyrus

The clearest difference is rating: Eyrus at 5.0 against Southwire® Voltage Drop Calc's 4.6. Southwire® Voltage Drop Calc's advantage is ratings volume (1.5K vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.

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

Eyrus 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 1, so its average is the more settled of the two.

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

## The numbers

| Metric | Southwire® Voltage Drop Calc | Eyrus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (1.5K ratings)](https://appshunter.io/ios/app/southwire-voltage-drop-calc/id440338420/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/eyrus/id1627024083/reviews)** |
| Number of ratings | **1.5K** | 1 |
| Positive reviews | 48.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | Free |
| Size | 10 MB | 14 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Southwire Company](https://appshunter.io/developer/440338423) | [Eyrus](https://appshunter.io/developer/1477751540) |

## 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


### Eyrus

[App page](https://appshunter.io/ios/app/eyrus/id1627024083)

This app simplifies workforce management by providing automatic check-in/out, timesheet viewing, and profile updates for tradespeople. It allows easy project registration via QR code scanning and streamlines document review and submission.

**Highlights:** Automatic job site check-in/out, View timesheets, Update profile and certifications, QR code project registration, Digital document signing, Workforce visibility

**Features:** Apple Wallet

**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 Eyrus free?

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

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

Eyrus is rated higher. Southwire® Voltage Drop Calc averages 4.6 out of 5 from 1.5K ratings, while Eyrus averages 5.0 from 1 ratings.

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

Neither Southwire® Voltage Drop Calc nor Eyrus shows ads.

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

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