# Fault Current Calculator vs NEMA Guide

The clearest difference is in-app purchases: NEMA Guide at none against Fault Current Calculator's 2. NEMA Guide also leads on update cadence (every 2 days vs every 4 months). Fault Current Calculator's advantage is iOS requirement (14.0 vs 17.6). On price, 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. NEMA Guide asks for nothing beyond the download.

Fault Current Calculator ships an update every 4 months, NEMA Guide every 2 days. The most recent releases landed on August 20, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Fault Current Calculator | NEMA Guide |
| --- | --- | --- |
| 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 2 days** |
| Monetization | Freemium | — |
| Size | 25 MB | 23 MB |
| Requires iOS | **14.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Cooper Bussmann, LLC](https://appshunter.io/developer/609315535) | [Red Zepp LLC](https://appshunter.io/developer/1812216821) |

## 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 |


### NEMA Guide

[App page](https://appshunter.io/ios/app/nema-guide/id6746103301)

**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 NEMA Guide free?

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

### Do Fault Current Calculator or NEMA Guide have ads?

Neither Fault Current Calculator nor NEMA Guide shows ads.

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

Fault Current Calculator ships an update every 4 months, and NEMA Guide every 2 days. Most recently, Fault Current Calculator was updated on August 20, 2026 and NEMA Guide on September 12, 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.*