Sosu der vs Prime Pick
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)
Prime Pick
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Let's pick a prime number! You'll become strong in numbers! 素数を選ぼう！数に強くなれるぞ！
Screenshots
Verdict
The clearest difference is ads: Prime Pick at none against Sosu der's shown. Prime Pick also leads on update cadence (every 2 days vs every 4 months). On price, in-app purchases, device support and iOS requirement 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. Neither carries in-app purchases, so what you see is what you pay.
Sosu der ships an update every 4 months, Prime Pick every 2 days. The most recent releases landed on September 13, 2026 and June 1, 2026 respectively.
| Parameter | Sosu der | Prime Pick |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | Every 2 days — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 140 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Hirobumi Onishi | Takumi Muraishi |
In-app purchases
Sosu der
No in-app purchases
Prime Pick
No in-app purchases
