# Southwire® Voltage Drop Calc vs Wire Phase

The clearest difference is price: Southwire® Voltage Drop Calc at Free against Wire Phase's $0.99. Southwire® Voltage Drop Calc also leads on rating (4.6 vs 2.8) and update cadence (every 2 months vs every 57 months). Wire Phase's advantage is iOS requirement (10.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

Southwire® Voltage Drop Calc is free to download; Wire Phase costs $0.99 up front. 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 2.8. That said, the two scores are not equally well evidenced: Southwire® Voltage Drop Calc has 1.5K ratings behind it against 10, 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 20% of Wire Phase's.

Southwire® Voltage Drop Calc ships an update every 2 months, Wire Phase every 57 months. The most recent releases landed on October 20, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Southwire® Voltage Drop Calc | Wire Phase |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.6 (1.5K ratings)](https://appshunter.io/ios/app/southwire-voltage-drop-calc/id440338420/reviews)** | [2.8 (10 ratings)](https://appshunter.io/ios/app/wire-phase/id607866075/reviews) |
| Number of ratings | **1.5K** | 10 |
| Positive reviews | **48.1% of reviews** | 20.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 57 months |
| Monetization | **Free** | Paid |
| Size | 10 MB | 16 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) | [TRNSFR](https://appshunter.io/developer/472903828) |

## 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


### Wire Phase

[App page](https://appshunter.io/ios/app/wire-phase/id607866075)

This utility app helps electricians and DIYers quickly identify and number electrical phases in single and three-phase circuits. It provides color codes for common voltage configurations and allows for easy navigation and bookmarking of circuit numbers.

**Highlights:** Identify 120/240 single phase, Identify 120/208 three phase, Identify 277/480 three phase, Endless scrolling interface, Jump to circuit number, Tap to remember place

**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 Wire Phase free?

Wire Phase costs $0.99, with no in-app purchases.

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

Southwire® Voltage Drop Calc is rated higher. Southwire® Voltage Drop Calc averages 4.6 out of 5 from 1.5K ratings, while Wire Phase averages 2.8 from 10 ratings.

### Do Southwire® Voltage Drop Calc or Wire Phase have ads?

Neither Southwire® Voltage Drop Calc nor Wire Phase shows ads.

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

Southwire® Voltage Drop Calc ships an update every 2 months, and Wire Phase every 57 months. Most recently, Southwire® Voltage Drop Calc was updated on October 20, 2026 and Wire Phase 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.*