# Southwire® Conversion Calc vs Voltage Drop Calculator.

The clearest difference is in-app purchases: Southwire® Conversion Calc at none against Voltage Drop Calculator.'s 1. Southwire® Conversion Calc also leads on ads (none vs shown). Voltage Drop Calculator.'s advantage is review sentiment (33% vs 0%) and rating (4.6 vs 4.2). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Voltage Drop Calculator. sells 1 one-off in-app purchase. Southwire® Conversion Calc asks for nothing beyond the download.

Voltage Drop Calculator. holds the better App Store score, 4.6 against 4.2. That said, the two scores are not equally well evidenced: Voltage Drop Calculator. has 410 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 0% of Southwire® Conversion Calc's written reviews are positive against 33% of Voltage Drop Calculator.'s.

Southwire® Conversion Calc ships an update every 4 months, Voltage Drop Calculator. every 3 months. The most recent releases landed on August 28, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Southwire® Conversion Calc | Voltage Drop Calculator. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (5 ratings)](https://appshunter.io/ios/app/southwire-conversion-calc/id545756420/reviews) | **[4.6 (410 ratings)](https://appshunter.io/ios/app/voltage-drop-calculator/id1203737064/reviews)** |
| Number of ratings | 5 | **410** |
| Positive reviews | 0.0% of reviews | **33.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 7 MB | 51 MB |
| Requires iOS | **16.6** | 17.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Southwire Company](https://appshunter.io/developer/440338423) | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) |

## What reviewers say

### Southwire® Conversion Calc

[App page](https://appshunter.io/ios/app/southwire-conversion-calc/id545756420)

This utility app facilitates conversions between copper and aluminum electrical wiring. It allows users to calculate pricing, unit of measure, conversion factors, and weight based on product length. The app comes preloaded with numerous cable types for easy calculation.

**Highlights:** Copper to aluminum conversion, Aluminum to copper conversion, Pricing unit of measure calculation, Conversion factor calculation, Weight per product length calculation, Preloaded cable data

**Features:** macOS Compatibility

**In-app purchases:** none


### Voltage Drop Calculator.

[App page](https://appshunter.io/ios/app/voltage-drop-calculator/id1203737064)

Calculate voltage drop and wire size using both NEC and IEC standards. Supports various load types, conductor materials, and system configurations. Generates detailed reports for electricians, engineers, and contractors.

**Highlights:** NEC and IEC dual standards, Voltage drop and wire sizing calculations, Support for continuous load and corrections, Copper or Aluminum conductor options, Single-phase and three-phase systems, Automatic compliance checks, PDF report generation

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Go Pro | $4.99 | one-time |


## Frequently asked questions

### Is Southwire® Conversion Calc free?

Southwire® Conversion Calc is free to download, with no in-app purchases.

### Is Voltage Drop Calculator. free?

Voltage Drop Calculator. is free to download, with in-app purchases available.

### Which has better reviews, Southwire® Conversion Calc or Voltage Drop Calculator.?

Voltage Drop Calculator. is rated higher. Southwire® Conversion Calc averages 4.2 out of 5 from 5 ratings, while Voltage Drop Calculator. averages 4.6 from 410 ratings.

### Do Southwire® Conversion Calc or Voltage Drop Calculator. have ads?

Voltage Drop Calculator. shows ads; Southwire® Conversion Calc does not.

### Which is updated more often, Southwire® Conversion Calc or Voltage Drop Calculator.?

Southwire® Conversion Calc ships an update every 4 months, and Voltage Drop Calculator. every 3 months. Most recently, Southwire® Conversion Calc was updated on August 28, 2026 and Voltage Drop Calculator. on September 18, 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.*