Sosu der vs RainMaker 4
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Sosu der
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This app is a quiz application that determines whether a number is prime or composite and swipes the correct answer. A prime number is a natural number greater than 1 that is not divisible by any other number except 1 and the number itself. For example, 2, 3, 5, and 7 are single-digit prime numbers. Composite numbers (composite numbers) are natural numbers greater than 1 that are not prime and are represented by the product of smaller natural numbers (e.g., 4 = 2 x 2, 6 = 2 x 3). Through this app, you can test your judgment and reflexes while having fun learning these mathematical concepts. ... How many two-digit, three-digit, and four-digit prime numbers do you know? Translated with www.DeepL.com/Translator (free version)
RainMaker 4
Create personalized soundscapes with realistic rain and nature sounds for relaxation, focus, and meditation. Design your ideal weather experience anytime, anywhere.
- Realistic rain sounds
- Nature soundscapes
- Customizable sound mixing
- Relaxation aid
- Focus enhancement
- Meditation tool
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“Relax, focus, and meditate with realistic rain and nature sounds. Build your perfect storm anywhere, anytime!”
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Sosu der | RainMaker 4 |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 4 months | Every 8 days — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 140 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Hirobumi Onishi | Trevor Phillips |
In-app purchases
Sosu der
No in-app purchases
RainMaker 4
- LightningStrikes$0.99
- rainforest$0.99
- rainOnMetal$0.99
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- thunderstorm$0.99
- rivers$0.99
- waterfalls$0.99
- continuousRainMode$4.99
