# Fault Current Calculator vs Circuit Navigator

The clearest difference is in-app purchases: Circuit Navigator at none against Fault Current Calculator's 2. On price, update cadence, 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. Circuit Navigator asks for nothing beyond the download.

Fault Current Calculator ships an update every 4 months, Circuit Navigator every 5 months. The most recent releases landed on October 2, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Fault Current Calculator | Circuit Navigator |
| --- | --- | --- |
| 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 5 months |
| Monetization | Freemium | — |
| Size | 25 MB | 24 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Cooper Bussmann, LLC](https://appshunter.io/developer/609315535) | [Persistent Engineering LLC](https://appshunter.io/developer/1702291478) |

## 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 |


### Circuit Navigator

[App page](https://appshunter.io/ios/app/circuit-navigator/id6461048331)

**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 Circuit Navigator free?

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

### Do Fault Current Calculator or Circuit Navigator have ads?

Neither Fault Current Calculator nor Circuit Navigator shows ads.

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

Fault Current Calculator ships an update every 4 months, and Circuit Navigator every 5 months. Most recently, Fault Current Calculator was updated on October 2, 2026 and Circuit Navigator on October 9, 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.*