# Fault Current Calculator vs VFD Cable Sizing Calc

The clearest difference is in-app purchases: VFD Cable Sizing Calc at none against Fault Current Calculator's 2. Fault Current Calculator's advantage is iOS requirement (14.0 vs 16.0). 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. VFD Cable Sizing Calc asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on August 20, 2026 and March 8, 2026 respectively.

## The numbers

| Metric | Fault Current Calculator | VFD Cable Sizing Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (23 ratings)](https://appshunter.io/ios/app/fault-current-calculator/id647477910/reviews)** | — |
| Number of ratings | **23** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Freemium | — |
| Size | 25 MB | 5 MB |
| Requires iOS | **14.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Cooper Bussmann, LLC](https://appshunter.io/developer/609315535) | [Southwire Company](https://appshunter.io/developer/440338423) |

## 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 |


### VFD Cable Sizing Calc

[App page](https://appshunter.io/ios/app/vfd-cable-sizing-calc/id6452802915)

**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 VFD Cable Sizing Calc free?

VFD Cable Sizing Calc is free to download, with no in-app purchases.

### Do Fault Current Calculator or VFD Cable Sizing Calc have ads?

Neither Fault Current Calculator nor VFD Cable Sizing Calc shows ads.

### Which is updated more often, Fault Current Calculator or VFD Cable Sizing Calc?

Fault Current Calculator ships an update every 4 months, and VFD Cable Sizing Calc every 4 months. Most recently, Fault Current Calculator was updated on August 20, 2026 and VFD Cable Sizing Calc on March 8, 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.*