# Fault Current Calculator vs FireAlarmGuy

The clearest difference is review sentiment: FireAlarmGuy at 100% against Fault Current Calculator's 0%. FireAlarmGuy also leads on rating (5.0 vs 3.1) and in-app purchases (none vs 2). Fault Current Calculator's advantage is ratings volume (23 vs 2). 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. FireAlarmGuy asks for nothing beyond the download.

FireAlarmGuy 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 2, 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 100% of FireAlarmGuy's.

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

## The numbers

| Metric | Fault Current Calculator | FireAlarmGuy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.1 (23 ratings)](https://appshunter.io/ios/app/fault-current-calculator/id647477910/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/firealarmguy/id6742727065/reviews)** |
| Number of ratings | **23** | 2 |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | Freemium | **Free** |
| Size | 25 MB | 15 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) | [Jack Dalton](https://appshunter.io/developer/1799610315) |

## 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 |


### FireAlarmGuy

[App page](https://appshunter.io/ios/app/firealarmguy/id6742727065)

This utility app provides two essential tools for fire alarm technicians. It features a calculator for determining DMX dip switch settings and a decoder for understanding battery manufacturing date codes, streamlining fieldwork.

**Highlights:** DMX Dip Switch Calculator, Battery Date Code Decoder, Device addressing assistance, Battery production date lookup, Fieldwork simplification

**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 FireAlarmGuy free?

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

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

FireAlarmGuy is rated higher. Fault Current Calculator averages 3.1 out of 5 from 23 ratings, while FireAlarmGuy averages 5.0 from 2 ratings.

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

Neither Fault Current Calculator nor FireAlarmGuy shows ads.

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

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