# Southwire® Voltage Drop Calc vs Electrical Diagram Maker

The clearest difference is rating: Southwire® Voltage Drop Calc at 4.6 against Electrical Diagram Maker's 1.0. Southwire® Voltage Drop Calc also leads on in-app purchases (none vs 1) and ratings volume (1.5K vs 1). Electrical Diagram Maker's advantage is update cadence (every 8 days vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Electrical Diagram Maker sells 1 in-app purchase, starting at $4.99 per month. Southwire® Voltage Drop Calc asks for nothing beyond the download.

Southwire® Voltage Drop Calc holds the better App Store score, 4.6 against 1.0. 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, Electrical Diagram Maker every 8 days. The most recent releases landed on November 6, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Southwire® Voltage Drop Calc | Electrical Diagram Maker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (1.5K ratings)](https://appshunter.io/ios/app/southwire-voltage-drop-calc/id440338420/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/electrical-diagram-maker/id6784986038/reviews) |
| Number of ratings | **1.5K** | 1 |
| Positive reviews | 49.1% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 8 days** |
| Monetization | **Free** | Freemium |
| Size | 10 MB | 5 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Southwire Company](https://appshunter.io/developer/440338423) | [Mirza Pasic](https://appshunter.io/developer/1863048976) |

## 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 Diagram Maker

[App page](https://appshunter.io/ios/app/electrical-diagram-maker/id6784986038)

Create professional electrical schematics, automotive wiring diagrams, and technical documentation. Offers a wide range of symbols, customizable features, and PDF export for efficient project creation and sharing across Apple devices.

**Highlights:** Create electrical and automotive diagrams, Extensive library of dedicated symbols, Customizable wire colors and sizes, Editable labels and title blocks, Cross-device project sharing, Professional PDF export (Pro subscription)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Electrical Diagram Maker Pro | $4.99 | per month |


## Frequently asked questions

### Is Southwire® Voltage Drop Calc free?

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

### Is Electrical Diagram Maker free?

Electrical Diagram Maker is free to download, with in-app purchases available.

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

Southwire® Voltage Drop Calc is rated higher. Southwire® Voltage Drop Calc averages 4.6 out of 5 from 1.5K ratings, while Electrical Diagram Maker averages 1.0 from 1 ratings.

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

Neither Southwire® Voltage Drop Calc nor Electrical Diagram Maker shows ads.

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

Southwire® Voltage Drop Calc ships an update every 2 months, and Electrical Diagram Maker every 8 days. Most recently, Southwire® Voltage Drop Calc was updated on November 6, 2026 and Electrical Diagram Maker on November 5, 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.*