# Southwire® Voltage Drop Calc vs CMC Swift

The clearest difference is rating: CMC Swift at 5.0 against Southwire® Voltage Drop Calc's 4.6. Southwire® Voltage Drop Calc's advantage is ratings volume (1.5K vs 1) and update cadence (every 2 months vs every 4 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CMC Swift 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.

Southwire® Voltage Drop Calc ships an update every 2 months, CMC Swift every 4 months. The most recent releases landed on September 17, 2026 and July 5, 2026 respectively.

## The numbers

| Metric | Southwire® Voltage Drop Calc | CMC Swift |
| --- | --- | --- |
| Price | Free | Free |
| 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/cmc-swift/id1498901607/reviews)** |
| Number of ratings | **1.5K** | 1 |
| Positive reviews | 48.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | Free | Free |
| Size | 10 MB | 127 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Southwire Company](https://appshunter.io/developer/440338423) | [OMICRON electronics GmbH](https://appshunter.io/developer/1233298257) |

## 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


### CMC Swift

[App page](https://appshunter.io/ios/app/cmc-swift/id1498901607)

Control Omicron CMCs to output analog voltages and currents, feed in binary signals, or measure them. Perform wiring and control system checks, as well as trip tests for protective functions quickly and easily. It also facilitates polarity checks when used with a handheld CPOL device.

**Highlights:** Output analog voltages and currents, Feed in binary signals, Measure binary signals, Perform wiring and control system checks, Conduct trip tests for protective functions, Perform polarity checks with CPOL device

**Features:** macOS Compatibility

**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 CMC Swift free?

CMC Swift is free to download, with no in-app purchases.

### Which has better reviews, Southwire® Voltage Drop Calc or CMC Swift?

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

### Do Southwire® Voltage Drop Calc or CMC Swift have ads?

Neither Southwire® Voltage Drop Calc nor CMC Swift shows ads.

### Which is updated more often, Southwire® Voltage Drop Calc or CMC Swift?

Southwire® Voltage Drop Calc ships an update every 2 months, and CMC Swift every 4 months. Most recently, Southwire® Voltage Drop Calc was updated on September 17, 2026 and CMC Swift on July 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*