# Fault Current Calculator vs Kopperfield

The clearest difference is rating: Kopperfield at 3.9 against Fault Current Calculator's 3.1. Kopperfield also leads on in-app purchases (none vs 2) and update cadence (every 3 weeks vs every 4 months). On price, review sentiment, ratings volume and ads there is nothing between them.

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

Kopperfield holds the better App Store score, 3.9 against 3.1. Both are backed by a comparable volume of ratings — 23 and 9 respectively. Written reviews split almost evenly too, at 0% and 0% positive.

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

## The numbers

| Metric | Fault Current Calculator | Kopperfield |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.1 (23 ratings)](https://appshunter.io/ios/app/fault-current-calculator/id647477910/reviews) | **[3.9 (9 ratings)](https://appshunter.io/ios/app/kopperfield/id6736772332/reviews)** |
| Number of ratings | **23** | 9 |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | Freemium | **Ad-supported** |
| Size | 25 MB | 45 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Cooper Bussmann, LLC](https://appshunter.io/developer/609315535) | [Kopperfield](https://appshunter.io/developer/1756157251) |

## 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 |


### Kopperfield

[App page](https://appshunter.io/ios/app/kopperfield/id6736772332)

Streamline electrical design and permitting with powerful tools for load calculations, panel schedules, and single-line diagrams. Quickly reference the National Electrical Code with an AI-powered chatbot and generate instant PDF reports for inspectors and clients.

**Highlights:** Load calculator with NEC standards, Single line diagram tool, Panel schedule creation, NEC chatbot, Instant PDF report generation, AI panel photo processing, Team dashboard

**Features:** macOS Compatibility, Vision Pro support

**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 Kopperfield free?

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

### Which has better reviews, Fault Current Calculator or Kopperfield?

Kopperfield is rated higher. Fault Current Calculator averages 3.1 out of 5 from 23 ratings, while Kopperfield averages 3.9 from 9 ratings.

### Do Fault Current Calculator or Kopperfield have ads?

Neither Fault Current Calculator nor Kopperfield shows ads.

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

Fault Current Calculator ships an update every 4 months, and Kopperfield every 3 weeks. Most recently, Fault Current Calculator was updated on October 2, 2026 and Kopperfield on October 3, 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.*