# Fault Current Calculator (PFC) vs VapourFlow

The clearest difference is monetization model: VapourFlow at free against Fault Current Calculator (PFC)'s paid. VapourFlow also leads on ads (none vs shown) and iOS requirement (9.0 vs 15.0). Fault Current Calculator (PFC)'s advantage is review sentiment (33% vs 0%) and update cadence (every 14 months vs every 27 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Fault Current Calculator (PFC) ships an update every 14 months, VapourFlow every 27 months. The most recent releases landed on October 14, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Fault Current Calculator (PFC) | VapourFlow |
| --- | --- | --- |
| Price | Free | Free |
| 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** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 14 months** | Every 27 months |
| Monetization | Paid | **Free** |
| Size | 10 MB | 8 MB |
| Requires iOS | 15.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Pro Certs Software Ltd](https://appshunter.io/developer/444429696) | [VapourFlow](https://appshunter.io/developer/1299099350) |

## 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


### VapourFlow

[App page](https://appshunter.io/ios/app/vapourflow/id1299099351)

This app controls a smart extractor vent designed to prevent smoke from spreading through ventilation systems. It detects smoke, measures heat and humidity, and can seal ventilation ports to compartmentalize dwellings during a fire.

**Highlights:** Smoke detection, Heat and humidity measurement, Ventilation port sealing, Intumescent disc sealing, Compartmentalization

**Features:** macOS Compatibility

**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 VapourFlow free?

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

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

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

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

Fault Current Calculator (PFC) ships an update every 14 months, and VapourFlow every 27 months. Most recently, Fault Current Calculator (PFC) was updated on October 14, 2026 and VapourFlow 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.*