# Fault Current Calculator vs CMC Swift

The clearest difference is rating: CMC Swift at 5.0 against Fault Current Calculator's 3.1. CMC Swift also leads on in-app purchases (none vs 2). Fault Current Calculator's advantage is ratings volume (23 vs 1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Fault Current Calculator sells 2 in-app purchases, starting at $4.99 per month. CMC Swift asks for nothing beyond the download.

CMC Swift holds the better App Store score, 5.0 against 3.1. That said, the two scores are not equally well evidenced: Fault Current Calculator has 23 ratings behind it against 1, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on August 20, 2026 and July 5, 2026 respectively.

## The numbers

| Metric | Fault Current Calculator | CMC Swift |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.1 (23 ratings)](https://appshunter.io/ios/app/fault-current-calculator/id647477910/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cmc-swift/id1498901607/reviews)** |
| Number of ratings | **23** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Freemium | **Free** |
| Size | 25 MB | 127 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Cooper Bussmann, LLC](https://appshunter.io/developer/609315535) | [OMICRON electronics GmbH](https://appshunter.io/developer/1233298257) |

## What reviewers say

### Fault Current Calculator

[App page](https://appshunter.io/ios/app/fault-current-calculator/id647477910)

This tool helps contractors, engineers, and electricians quickly calculate available fault current on single and three-phase electrical systems. It also assists in sizing fuses and conductors for various circuits and can generate labels for service equipment.

**Highlights:** Calculate available fault current, Size fuses and conductors, Generate service equipment labels, Single and three-phase system support, NEC® 110.24 compliance

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly Subscription | $4.99 | per month |
| Pro Annual Subscription | $39.99 | per year |


### 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 Fault Current Calculator free?

Fault Current Calculator is free to download, with in-app purchases available.

### Is CMC Swift free?

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

### Which has better reviews, Fault Current Calculator or CMC Swift?

CMC Swift is rated higher. Fault Current Calculator averages 3.1 out of 5 from 23 ratings, while CMC Swift averages 5.0 from 1 ratings.

### Do Fault Current Calculator or CMC Swift have ads?

Neither Fault Current Calculator nor CMC Swift shows ads.

### Which is updated more often, Fault Current Calculator or CMC Swift?

Fault Current Calculator ships an update every 4 months, and CMC Swift every 4 months. Most recently, Fault Current Calculator was updated on August 20, 2026 and CMC Swift on July 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.*