# Fault Current Calculator (PFC) vs PhosphorHertz

The clearest difference is price: Fault Current Calculator (PFC) at Free against PhosphorHertz's $0.99. Fault Current Calculator (PFC) also leads on iOS requirement (15.0 vs 26.2). PhosphorHertz's advantage is ads (none vs shown) and update cadence (every 4 months vs every 14 months). On in-app purchases and device support there is nothing between them.

Fault Current Calculator (PFC) is free to download; PhosphorHertz costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Fault Current Calculator (PFC) ships an update every 14 months, PhosphorHertz every 4 months. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Fault Current Calculator (PFC) | PhosphorHertz |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[1.0 (2 ratings)](https://appshunter.io/ios/app/fault-current-calculator-pfc/id577611194/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 14 months | **Every 4 months** |
| Monetization | Paid | — |
| Size | 10 MB | 5 MB |
| Requires iOS | **15.0** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Pro Certs Software Ltd](https://appshunter.io/developer/444429696) | [Stuart Woolley](https://appshunter.io/developer/315697638) |

## 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


### PhosphorHertz

[App page](https://appshunter.io/ios/app/phosphorhertz/id6759729656)

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

**In-app purchases:** none


## Frequently asked questions

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

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

### Is PhosphorHertz free?

PhosphorHertz costs $0.99, with no in-app purchases.

### Do Fault Current Calculator (PFC) or PhosphorHertz have ads?

Fault Current Calculator (PFC) shows ads; PhosphorHertz does not.

### Which is updated more often, Fault Current Calculator (PFC) or PhosphorHertz?

Fault Current Calculator (PFC) ships an update every 14 months, and PhosphorHertz every 4 months. Most recently, Fault Current Calculator (PFC) was updated on November 6, 2026 and PhosphorHertz on October 31, 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.*