# Southwire® Voltage Drop Calc vs E

The clearest difference is update cadence: Southwire® Voltage Drop Calc at every 2 months against E's every 18 months. Southwire® Voltage Drop Calc also leads on ratings volume (1.5K vs 1). E's advantage is rating (5.0 vs 4.6) and iOS requirement (13.0 vs 15.0). 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.

E 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, E every 18 months. The most recent releases landed on October 20, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Southwire® Voltage Drop Calc | E |
| --- | --- | --- |
| 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/e-wire-calc/id885429495/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** | Every 18 months |
| Monetization | Free | Free |
| Size | 10 MB | 26 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Southwire Company](https://appshunter.io/developer/440338423) | [ELEKTRISOLA](https://appshunter.io/developer/885429498) |

## 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


### E

[App page](https://appshunter.io/ios/app/e-wire-calc/id885429495)

This tool helps determine technical characteristics of enamelled copper wire based on industry standards. It offers functions for diameter conversion, resistance calculations, and breakdown voltage.

**Highlights:** Diameter conversion (mm, inch, AWG), Resistance calculation, Metal wire diameter calculation, Resistance tolerance, Enamelled copper quantity and length, Breakdown voltage, Winding tension calculation, Overall diameter tolerance

**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 E free?

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

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

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

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

Neither Southwire® Voltage Drop Calc nor E shows ads.

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

Southwire® Voltage Drop Calc ships an update every 2 months, and E every 18 months. Most recently, Southwire® Voltage Drop Calc was updated on October 20, 2026 and E on September 12, 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.*