# Sunfollower vs Gx FoCalc

The clearest difference is price: Gx FoCalc at Free against Sunfollower's $2.99. Gx FoCalc also leads on rating (4.9 vs 4.1) and update cadence (daily vs every 4 months). Sunfollower's advantage is iOS requirement (10.0 vs 17.5). On ratings volume, ads, in-app purchases and device support there is nothing between them.

Gx FoCalc is free to download; Sunfollower costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Gx FoCalc holds the better App Store score, 4.9 against 4.1. Both are backed by a comparable volume of ratings — 12 and 7 respectively. Written reviews point the same way: 70% of Sunfollower's written reviews are positive against 100% of Gx FoCalc's.

Sunfollower ships an update every 4 months, Gx FoCalc daily. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Sunfollower | Gx FoCalc |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [4.1 (12 ratings)](https://appshunter.io/ios/app/sunfollower/id633423871/reviews) | **[4.9 (7 ratings)](https://appshunter.io/ios/app/gx-focalc/id6612010267/reviews)** |
| Number of ratings | **12** | 7 |
| Positive reviews | 70.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Daily** |
| Monetization | Paid | **Free** |
| Size | 22 MB | 0 MB |
| Requires iOS | **10.0** | 17.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Evgeny Vostrikov](https://appshunter.io/developer/633423874) | [Casey Cavanaugh](https://appshunter.io/developer/1761279780) |

## What reviewers say

### Sunfollower

[App page](https://appshunter.io/ios/app/sunfollower/id633423871)

Visualize sunrise, sunset, and sun direction for any day and location. Features an interactive AR view to calculate sun positions and provides twilight times, elevation, azimuth, and shadow ratios.

**Highlights:** Sunrise and sunset position tracking, Interactive Augmented Reality view, Civil, nautical, astronomical twilight times, Sun elevation and azimuth, Shadow ratio calculation

**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 Sunfollower free?

Sunfollower costs $2.99, with no in-app purchases.

### Is Gx FoCalc free?

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

### Which has better reviews, Sunfollower or Gx FoCalc?

Gx FoCalc is rated higher. Sunfollower averages 4.1 out of 5 from 12 ratings, while Gx FoCalc averages 4.9 from 7 ratings.

### Do Sunfollower or Gx FoCalc have ads?

Neither Sunfollower nor Gx FoCalc shows ads.

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

Sunfollower ships an update every 4 months, and Gx FoCalc daily. Most recently, Sunfollower was updated on October 26, 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.*