# Sun vs FitSkyGo

The clearest difference is in-app purchases: FitSkyGo at none against Sun's 3. FitSkyGo also leads on update cadence (every 4 days vs every 2 weeks) and iOS requirement (16.0 vs 26.0). Sun's advantage is device support (4 vs 1). On price and ads there is nothing between them.

Both are free to download. Sun sells 3 one-off in-app purchases. FitSkyGo asks for nothing beyond the download.

Sun ships an update every 2 weeks, FitSkyGo every 4 days. The most recent releases landed on October 8, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Sun | FitSkyGo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 4 days** |
| Size | 21 MB | 51 MB |
| Requires iOS | 26.0 | **16.0** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Michael Lauer](https://appshunter.io/developer/300205595) | [嘉军 陈](https://appshunter.io/developer/1726884953) |

## What reviewers say

### Sun

[App page](https://appshunter.io/ios/app/sun-dog/id6779601811)

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $1.99 | one-time |
| Medium Tip | $3.99 | one-time |
| Large Tip | $6.99 | one-time |


### FitSkyGo

[App page](https://appshunter.io/ios/app/fitskygo/id6790631317)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sun free?

Sun is free to download, with in-app purchases available.

### Is FitSkyGo free?

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

### Do Sun or FitSkyGo have ads?

Neither Sun nor FitSkyGo shows ads.

### Which is updated more often, Sun or FitSkyGo?

Sun ships an update every 2 weeks, and FitSkyGo every 4 days. Most recently, Sun was updated on October 8, 2026 and FitSkyGo on October 28, 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.*