# Southwire® Voltage Drop Calc vs Electrical Calc Pro

The clearest difference is price: Southwire® Voltage Drop Calc at Free against Electrical Calc Pro's $19.99. Southwire® Voltage Drop Calc also leads on ratings volume (1.5K vs 1). Electrical Calc Pro's advantage is rating (5.0 vs 4.6) and review sentiment (60% vs 49%). On update cadence, ads, in-app purchases and device support there is nothing between them.

Southwire® Voltage Drop Calc is free to download; Electrical Calc Pro costs $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Electrical Calc Pro 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. Written reviews point the same way: 49% of Southwire® Voltage Drop Calc's written reviews are positive against 60% of Electrical Calc Pro's.

Southwire® Voltage Drop Calc ships an update every 2 months, Electrical Calc Pro every 5 weeks. Both last shipped on November 1, 2026.

## The numbers

| Metric | Southwire® Voltage Drop Calc | Electrical Calc Pro |
| --- | --- | --- |
| Price | **Free** | $19.99 |
| 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/electrical-calc-pro/id514793318/reviews)** |
| Number of ratings | **1.5K** | 1 |
| Positive reviews | 49.1% of reviews | **60.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | **Free** | Paid |
| Size | 10 MB | 22 MB |
| Requires iOS | 15.0 | **8.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Southwire Company](https://appshunter.io/developer/440338423) | [Snappy Appz Inc.](https://appshunter.io/developer/375591377) |

## 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


### Electrical Calc Pro

[App page](https://appshunter.io/ios/app/electrical-calc-pro/id514793318)

This professional electrical application calculates common electrical problems, including wire sizing, conduit sizing, and fusing based on the Canadian Electric Code. It offers advanced features for motor loads, transformers, feeders, and voltage drop calculations, making it an essential tool for electricians and engineers.

**Highlights:** Wire and conduit sizing, Motor and transformer load calculations, Voltage drop calculations, Panel legend creation and export, Allowable ampacity and derating, Box fill calculations

**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 Electrical Calc Pro free?

Electrical Calc Pro costs $19.99, with no in-app purchases.

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

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

### Do Southwire® Voltage Drop Calc or Electrical Calc Pro have ads?

Neither Southwire® Voltage Drop Calc nor Electrical Calc Pro shows ads.

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

Southwire® Voltage Drop Calc ships an update every 2 months, and Electrical Calc Pro every 5 weeks. Most recently, Southwire® Voltage Drop Calc was updated on November 1, 2026 and Electrical Calc Pro on November 1, 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.*