# Gx FoCalc vs TetherCam

Gx FoCalc and TetherCam are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Both ship on a similar rhythm, roughly daily. The most recent releases landed on October 7, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Gx FoCalc | TetherCam |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/gx-focalc/id6612010267/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Daily | Daily |
| Monetization | Free | — |
| Size | 0 MB | 2 MB |
| Requires iOS | 17.5 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Casey Cavanaugh](https://appshunter.io/developer/1761279780) | [Bernhard Goetzendorfer](https://appshunter.io/developer/1153350197) |

## What reviewers say

### 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


### TetherCam

[App page](https://appshunter.io/ios/app/tethercam/id6808997521)

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

**In-app purchases:** none


## Frequently asked questions

### Is Gx FoCalc free?

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

### Is TetherCam free?

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

### Do Gx FoCalc or TetherCam have ads?

Neither Gx FoCalc nor TetherCam shows ads.

### Which is updated more often, Gx FoCalc or TetherCam?

Gx FoCalc ships an update daily, and TetherCam daily. Most recently, Gx FoCalc was updated on October 7, 2026 and TetherCam on October 16, 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.*