Headjack Operator vs Gx FoCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Headjack Operator
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Headjack Operator – your ultimate solution for synchronized AR/VR immersive video playback and mobile device management. Effortlessly control multiple devices via a user-friendly Tablet interface. Whether it's AR, VR, or mobile device, take charge easily. Even offline, thanks to downloaded content. Just a WiFi network sets the stage for synchronized viewing. Perfectly complements Headjack Essential templates and Headjack Link. Get Headjack Operator now for seamless sync viewings of all your immersive videos.
Gx FoCalc
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.
- 35mm crop factor calculation
- Equivalent focal length
- Apparent aperture calculation
- Supports focal reducers
- Supports teleconverters
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FoCalc by [Gx]Ace Is the internet's best 35mm Crop Factor Calculator. Ever wonder what the 35mm equivalent of a 23mm f2 on APS-C would be? Ever wonder what that 120mm f8 8x10 lens would be if it were put in 35mm terms? Well now you can know it all with FoCalc! FoCalc allows you to input a focal length and aperture as well as a focal reducer or teleconverter and automatically calculates the equivalent focal length and apparent aperture on 35mm Full Frame.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Headjack Operator | Gx FoCalc |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.9 (7 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 7 — better |
| Update frequency | Every 9 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPad | iPhone, iPad — better |
| Requires iOS | 12.1 — better | 17.5 |
| Further details — not scored | ||
| Size | 90 MB | 0 MB |
| Age rating | 4+ | 4+ |
| Developer | Purple Pill VR B.V. | Casey Cavanaugh |
In-app purchases
Headjack Operator
No in-app purchases
Gx FoCalc
No in-app purchases
Questions
Is Headjack Operator free?
Is Gx FoCalc free?
Do Headjack Operator or Gx FoCalc have ads?
Which is updated more often, Headjack Operator or Gx FoCalc?
Other comparisons
