# Fault Current Calculator vs Building Wire Reliability Calc

The clearest difference is in-app purchases: Building Wire Reliability Calc at none against Fault Current Calculator's 2. Building Wire Reliability Calc also leads on update cadence (every 3 weeks vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

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

Fault Current Calculator ships an update every 4 months, Building Wire Reliability Calc every 3 weeks. The most recent releases landed on October 2, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Fault Current Calculator | Building Wire Reliability 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 3 weeks** |
| Monetization | Freemium | — |
| Size | 25 MB | 6 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) | [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 |


### Building Wire Reliability Calc

[App page](https://appshunter.io/ios/app/building-wire-reliability-calc/id6747445082)

**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 Building Wire Reliability Calc free?

Building Wire Reliability Calc is free to download, with no in-app purchases.

### Do Fault Current Calculator or Building Wire Reliability Calc have ads?

Neither Fault Current Calculator nor Building Wire Reliability Calc shows ads.

### Which is updated more often, Fault Current Calculator or Building Wire Reliability Calc?

Fault Current Calculator ships an update every 4 months, and Building Wire Reliability Calc every 3 weeks. Most recently, Fault Current Calculator was updated on October 2, 2026 and Building Wire Reliability Calc on October 11, 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.*