# Fault Current Calculator vs Box Fill Calc

The clearest difference is review sentiment: Box Fill Calc at 60% against Fault Current Calculator's 0%. Box Fill Calc also leads on in-app purchases (none vs 2) and rating (3.2 vs 3.0). Fault Current Calculator's advantage is price (Free vs $4.99) and ratings volume (27 vs 5). On update cadence, ads and device support there is nothing between them.

Fault Current Calculator is free to download; Box Fill Calc costs $4.99 up front. Fault Current Calculator sells 2 in-app purchases, starting at $4.99 per month. Box Fill Calc asks for nothing beyond the download.

Box Fill Calc holds the better App Store score, 3.2 against 3.0. That said, the two scores are not equally well evidenced: Fault Current Calculator has 27 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 0% of Fault Current Calculator's written reviews are positive against 60% of Box Fill Calc's.

Fault Current Calculator ships an update every 4 months, Box Fill Calc every 3 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Fault Current Calculator | Box Fill Calc |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | [3.0 (27 ratings)](https://appshunter.io/ios/app/fault-current-calculator/id647477910/reviews) | **[3.2 (5 ratings)](https://appshunter.io/ios/app/box-fill-calc/id895211266/reviews)** |
| Number of ratings | **27** | 5 |
| Positive reviews | 0.0% of reviews | **60.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | **Freemium** | Paid |
| Size | 25 MB | 18 MB |
| Requires iOS | 14.0 | **8.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Cooper Bussmann, LLC](https://appshunter.io/developer/609315535) | [Snappy Appz Inc.](https://appshunter.io/developer/375591377) |

## 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 |


### Box Fill Calc

[App page](https://appshunter.io/ios/app/box-fill-calc/id895211266)

This app simplifies electrical box fill calculations for any job size. It allows users to create and save unlimited calculations, solve for various box sizes, and export results to spreadsheets or print directly. It supports current electrical code standards and includes a built-in construction calculator.

**Highlights:** Unlimited saved calculations, Solve for custom and compound boxes, Export results to spreadsheet, Direct printing via AirPrint, Supports 2014 NEC and 2012, Built-in construction calculator

**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 Box Fill Calc free?

Box Fill Calc costs $4.99, with no in-app purchases.

### Which has better reviews, Fault Current Calculator or Box Fill Calc?

Box Fill Calc is rated higher. Fault Current Calculator averages 3.0 out of 5 from 27 ratings, while Box Fill Calc averages 3.2 from 5 ratings.

### Do Fault Current Calculator or Box Fill Calc have ads?

Neither Fault Current Calculator nor Box Fill Calc shows ads.

### Which is updated more often, Fault Current Calculator or Box Fill Calc?

Fault Current Calculator ships an update every 4 months, and Box Fill Calc every 3 months. Most recently, Fault Current Calculator was updated on October 23, 2026 and Box Fill Calc on October 24, 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.*