# Fault Current Calculator (PFC) vs Arc Flash Label Calculator

The clearest difference is rating: Arc Flash Label Calculator at 3.5 against Fault Current Calculator (PFC)'s 1.0. Arc Flash Label Calculator also leads on ads (none vs shown) and update cadence (fortnightly vs every 14 months). Fault Current Calculator (PFC)'s advantage is in-app purchases (none vs 1). On price and device support there is nothing between them.

Both are free to download. Arc Flash Label Calculator sells 1 one-off in-app purchase. Fault Current Calculator (PFC) asks for nothing beyond the download.

Arc Flash Label Calculator holds the better App Store score, 3.5 against 1.0. Both are backed by a comparable volume of ratings — 2 and 6 respectively. Written reviews point the same way: 33% of Fault Current Calculator (PFC)'s written reviews are positive against 50% of Arc Flash Label Calculator's.

Fault Current Calculator (PFC) ships an update every 14 months, Arc Flash Label Calculator fortnightly. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Fault Current Calculator (PFC) | Arc Flash Label Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (2 ratings)](https://appshunter.io/ios/app/fault-current-calculator-pfc/id577611194/reviews) | **[3.5 (6 ratings)](https://appshunter.io/ios/app/arc-flash-label-calculator/id1363795374/reviews)** |
| Number of ratings | 2 | **6** |
| Positive reviews | 33.3% of reviews | **50.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 14 months | **Fortnightly** |
| Monetization | Paid | **Free** |
| Size | 10 MB | 20 MB |
| Requires iOS | 15.0 | **9.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Pro Certs Software Ltd](https://appshunter.io/developer/444429696) | [Octagon Seven LLC](https://appshunter.io/developer/1200115862) |

## What reviewers say

### Fault Current Calculator (PFC)

[App page](https://appshunter.io/ios/app/fault-current-calculator-pfc/id577611194)

This app calculates prospective fault current (PFC) in kA and Amps for single and three-phase circuits. It allows users to input any two values (voltage, earth loop impedance, or PFC) to determine the third, aiding in selecting appropriate circuit breaker ratings.

**Highlights:** Calculate PFC from Zs/Ze and Voltage, Calculate Zs/Ze from Voltage and PFC, Calculate Voltage from PFC and Zs/Ze, PFC calculation in kA and Amps, Single and three-phase support, Input any two values to calculate the third

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

**In-app purchases:** none


### Arc Flash Label Calculator

[App page](https://appshunter.io/ios/app/arc-flash-label-calculator/id1363795374)

Calculate and generate arc flash labels for electrical equipment. Input data to produce PDF labels based on NFPA 70E standards, including incident energy and approach boundaries. Supports various circuit breakers, fuses, and voltage levels.

**Highlights:** Arc flash label calculation, NFPA 70E Annex D.4 methodology, Support for MCCB, ICCB, LSI, and fuses, Calculates Incident Energy, Arc Flash Boundary, Approach Boundaries, Generates PDF labels (4 per sheet), Supports low, medium, and high voltage equipment, Custom configurations for gap, distance, and time

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock High Voltage Arc Flash | $19.99 | one-time |


## Frequently asked questions

### Is Fault Current Calculator (PFC) free?

Fault Current Calculator (PFC) is free to download, with no in-app purchases.

### Is Arc Flash Label Calculator free?

Arc Flash Label Calculator is free to download, with in-app purchases available.

### Which has better reviews, Fault Current Calculator (PFC) or Arc Flash Label Calculator?

Arc Flash Label Calculator is rated higher. Fault Current Calculator (PFC) averages 1.0 out of 5 from 2 ratings, while Arc Flash Label Calculator averages 3.5 from 6 ratings.

### Do Fault Current Calculator (PFC) or Arc Flash Label Calculator have ads?

Fault Current Calculator (PFC) shows ads; Arc Flash Label Calculator does not.

### Which is updated more often, Fault Current Calculator (PFC) or Arc Flash Label Calculator?

Fault Current Calculator (PFC) ships an update every 14 months, and Arc Flash Label Calculator fortnightly. Most recently, Fault Current Calculator (PFC) was updated on October 24, 2026 and Arc Flash Label Calculator on October 29, 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.*