# Fault Current Calculator (PFC) vs PAT Test Pro

The clearest difference is in-app purchases: Fault Current Calculator (PFC) at none against PAT Test Pro's 6. Fault Current Calculator (PFC) also leads on review sentiment (33% vs 0%) and iOS requirement (15.0 vs 18.6). PAT Test Pro's advantage is ads (none vs shown) and update cadence (every 2 weeks vs every 14 months). On price and device support there is nothing between them.

Both are free to download. PAT Test Pro sells 6 in-app purchases, starting at $24.99 per month. Fault Current Calculator (PFC) asks for nothing beyond the download.

Fault Current Calculator (PFC) ships an update every 14 months, PAT Test Pro every 2 weeks. The most recent releases landed on October 14, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Fault Current Calculator (PFC) | PAT Test Pro |
| --- | --- | --- |
| 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** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 14 months | **Every 2 weeks** |
| Monetization | **Paid** | Subscription |
| Size | 10 MB | 115 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Pro Certs Software Ltd](https://appshunter.io/developer/444429696) | [iCertifi](https://appshunter.io/developer/490104127) |

## 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


### PAT Test Pro

[App page](https://appshunter.io/ios/app/pat-test-pro/id6746668717)

Streamline portable appliance testing with intelligent cloud sync and advanced barcode scanning. Generate professional, compliant certificates instantly for your clients. Designed for electrical contractors seeking efficiency and mobility.

**Highlights:** Seamless cloud sync across Apple devices, Advanced barcode scanning for auto-fill, Unlimited appliance and certificate testing, Instant, professional, compliant certification, Customizable certificate colors and company branding, Built-in database of common appliances

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Subscription | $24.99 | per month |
| PAT Test Pro | $119.99 | per year |
| PAT Test Pro | $349.00 | per year |
| 50 AI | $4.99 | one-time |
| 250 Appliance Scan credits | $19.99 | one-time |
| 1000 AI Credits | $39.99 | 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 PAT Test Pro free?

PAT Test Pro is free to download, with in-app purchases available.

### Do Fault Current Calculator (PFC) or PAT Test Pro have ads?

Fault Current Calculator (PFC) shows ads; PAT Test Pro does not.

### Which is updated more often, Fault Current Calculator (PFC) or PAT Test Pro?

Fault Current Calculator (PFC) ships an update every 14 months, and PAT Test Pro every 2 weeks. Most recently, Fault Current Calculator (PFC) was updated on October 14, 2026 and PAT Test Pro on October 5, 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.*