# Headjack Operator vs Gx FoCalc

The clearest difference is update cadence: Gx FoCalc at daily against Headjack Operator's every 9 months. Headjack Operator's advantage is iOS requirement (12.1 vs 17.5). On price, ads, 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.

Headjack Operator ships an update every 9 months, Gx FoCalc daily. The most recent releases landed on October 19, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Headjack Operator | Gx FoCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (7 ratings)](https://appshunter.io/ios/app/gx-focalc/id6612010267/reviews)** |
| Number of ratings | — | **7** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Daily** |
| Monetization | — | Free |
| Size | 90 MB | 0 MB |
| Requires iOS | **12.1** | 17.5 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Purple Pill VR B.V.](https://appshunter.io/developer/1081442210) | [Casey Cavanaugh](https://appshunter.io/developer/1761279780) |

## What reviewers say

### Headjack Operator

[App page](https://appshunter.io/ios/app/headjack-operator/id1472170176)

**Features:** macOS Compatibility

**In-app purchases:** none


### Gx FoCalc

[App page](https://appshunter.io/ios/app/gx-focalc/id6612010267)

Easily calculate the 35mm equivalent focal length and apparent aperture for various camera sensor sizes and lens configurations. Input your focal length, aperture, and any focal reducers or teleconverters to see the full-frame equivalent.

**Highlights:** 35mm crop factor calculation, Equivalent focal length, Apparent aperture calculation, Supports focal reducers, Supports teleconverters

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Headjack Operator free?

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

### Is Gx FoCalc free?

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

### Do Headjack Operator or Gx FoCalc have ads?

Neither Headjack Operator nor Gx FoCalc shows ads.

### Which is updated more often, Headjack Operator or Gx FoCalc?

Headjack Operator ships an update every 9 months, and Gx FoCalc daily. Most recently, Headjack Operator was updated on October 19, 2026 and Gx FoCalc on October 24, 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.*