# Southwire® Voltage Drop Calc vs DC Wire Sizer

The clearest difference is review sentiment: DC Wire Sizer at 100% against Southwire® Voltage Drop Calc's 48%. DC Wire Sizer also leads on rating (5.0 vs 4.6) and chart position (#169 vs unranked). Southwire® Voltage Drop Calc's advantage is price (Free vs $2.99) and update cadence (every 2 months vs every 20 months). On ads, in-app purchases and device support there is nothing between them.

Southwire® Voltage Drop Calc is free to download; DC Wire Sizer costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

DC Wire Sizer 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 24, 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 DC Wire Sizer's.

Southwire® Voltage Drop Calc ships an update every 2 months, DC Wire Sizer every 20 months. The most recent releases landed on October 20, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Southwire® Voltage Drop Calc | DC Wire Sizer |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | [4.6 (1.5K ratings)](https://appshunter.io/ios/app/southwire-voltage-drop-calc/id440338420/reviews) | **[5.0 (24 ratings)](https://appshunter.io/ios/app/dc-wire-sizer/id629190351/reviews)** |
| Number of ratings | **1.5K** | 24 |
| Positive reviews | 48.1% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 20 months |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#169** |
| Size | 10 MB | 21 MB |
| Requires iOS | 15.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Southwire Company](https://appshunter.io/developer/440338423) | [Dirty Dog Software, LLC](https://appshunter.io/developer/629190354) |

## 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


### DC Wire Sizer

[App page](https://appshunter.io/ios/app/dc-wire-sizer/id629190351)

**Currently charting:** #169 Top Paid · Utilities (US App Store)

Calculate appropriate DC wire sizes for electrical projects, preventing equipment damage and fires. Save, edit, and export wire run details for electrical plans and material purchases. Features a wizard for easy sizing for all users.

**Highlights:** Calculates wire size, voltage drop, and ampacity, Supports custom DC voltages up to 500 amps, Save, edit, and export wire run details, Sizer Wizard for easy calculations, Select marine standards (ABYC or ISO), Choose from various wire types and insulation ratings

**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 DC Wire Sizer free?

DC Wire Sizer costs $2.99, with no in-app purchases.

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

DC Wire Sizer is rated higher. Southwire® Voltage Drop Calc averages 4.6 out of 5 from 1.5K ratings, while DC Wire Sizer averages 5.0 from 24 ratings.

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

Neither Southwire® Voltage Drop Calc nor DC Wire Sizer shows ads.

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

Southwire® Voltage Drop Calc ships an update every 2 months, and DC Wire Sizer every 20 months. Most recently, Southwire® Voltage Drop Calc was updated on October 20, 2026 and DC Wire Sizer on October 3, 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.*