# Sosu der vs Sky Rivon

The clearest difference is in-app purchases: Sosu der at none against Sky Rivon's 1. Sky Rivon's advantage is update cadence (monthly vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Sky Rivon sells 1 one-off in-app purchase. Sosu der asks for nothing beyond the download.

Sosu der ships an update every 4 months, Sky Rivon monthly. The most recent releases landed on October 1, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Sosu der | Sky Rivon |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | — | Free with in-app purchases |
| Size | 140 MB | 252 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Hirobumi Onishi](https://appshunter.io/developer/1740115066) | [Concetto Antonino Privitera](https://appshunter.io/developer/1791634556) |

## What reviewers say

### Sosu der

[App page](https://appshunter.io/ios/app/sosu-der/id6483364985)

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

**In-app purchases:** none


### Sky Rivon

[App page](https://appshunter.io/ios/app/sky-rivon/id6740828708)

Embark on a thrilling river adventure through a magical sky. Tap to create and widen your path, navigating unpredictable obstacles and collecting rewards. Enjoy a visually stunning, one-finger control experience with exciting challenges.

**Highlights:** Fantasy-like sky river adventure, One-finger tap controls, Dynamic path creation and widening, Navigate obstacles and dangers, Collect coins for rewards, Unlock new boat skins

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove non-rewarded ads | $3.99 | one-time |


## Frequently asked questions

### Is Sosu der free?

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

### Is Sky Rivon free?

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

### Do Sosu der or Sky Rivon have ads?

Both Sosu der and Sky Rivon show ads.

### Which is updated more often, Sosu der or Sky Rivon?

Sosu der ships an update every 4 months, and Sky Rivon monthly. Most recently, Sosu der was updated on October 1, 2026 and Sky Rivon on September 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.*