# Sosu der vs RainMaker 4

The clearest difference is in-app purchases: Sosu der at none against RainMaker 4's 7. Sosu der also leads on iOS requirement (15.0 vs 18.0). RainMaker 4's advantage is ads (none vs shown) and update cadence (every 8 days vs every 4 months). On price and device support there is nothing between them.

Both are free to download. RainMaker 4 sells 7 one-off in-app purchases. Sosu der asks for nothing beyond the download.

Sosu der ships an update every 4 months, RainMaker 4 every 8 days. The most recent releases landed on October 1, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Sosu der | RainMaker 4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/rainmaker-4/id6751785587/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 8 days** |
| Monetization | — | Free with in-app purchases |
| Size | 140 MB | 7 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hirobumi Onishi](https://appshunter.io/developer/1740115066) | [Trevor Phillips](https://appshunter.io/developer/1836803938) |

## 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


### RainMaker 4

[App page](https://appshunter.io/ios/app/rainmaker-4/id6751785587)

Create personalized soundscapes with realistic rain and nature sounds for relaxation, focus, and meditation. Design your ideal weather experience anytime, anywhere.

**Highlights:** Realistic rain sounds, Nature soundscapes, Customizable sound mixing, Relaxation aid, Focus enhancement, Meditation tool

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LightningStrikes | $0.99 | one-time |
| rainforest | $0.99 | one-time |
| rainOnMetal | $0.99 | one-time |
| thunderstorm | $0.99 | one-time |
| rivers | $0.99 | one-time |
| waterfalls | $0.99 | one-time |
| continuousRainMode | $4.99 | one-time |


## Frequently asked questions

### Is Sosu der free?

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

### Is RainMaker 4 free?

RainMaker 4 is free to download, with in-app purchases available.

### Do Sosu der or RainMaker 4 have ads?

Sosu der shows ads; RainMaker 4 does not.

### Which is updated more often, Sosu der or RainMaker 4?

Sosu der ships an update every 4 months, and RainMaker 4 every 8 days. Most recently, Sosu der was updated on October 1, 2026 and RainMaker 4 on September 29, 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.*