Sosu der
Hirobumi Onishi Games iPhoneiPadiPod touch
Sosu der is a free Games app for iPhone and iPad by Hirobumi Onishi. Requires iOS 15.0. Updated August 2, 2026.
- Price
- Free
- on the App Store
- Size
- 140 MB
- Age 4+
- Updated
- Aug 2
- 2026 · v1.3
Screenshots
About Sosu der
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)
What’s new
Version 1.3 · Updated August 2, 2026
Improved app stability and updated the advertising system. Added access to the Privacy Policy from the Settings screen.
App privacy
The developer, Hirobumi Onishi, reported these privacy practices to Apple.
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers: Device ID
Data Linked to You
The following data, which may be collected and linked to your identity, may be used for the following purposes:
- Purchases: Purchase History
- Location: Coarse Location
- Identifiers: Device ID, User ID
- Usage Data: Product Interaction, Advertising Data, Other Usage Data
- Diagnostics: Performance Data
- Other Data: Other Data Types
Used for: Third-Party Advertising, Analytics, App Functionality
Data Not Linked to You
The following data, which may be collected but is not linked to your identity, may be used for the following purposes:
- Usage Data: Advertising Data
- Diagnostics: Other Diagnostic Data, Crash Data
- User Content: Customer Support
Used for: Analytics, App Functionality
Alternatives to Sosu der
Looking for apps like Sosu der? Here are 6 similar apps on the App Store. The highest rated is PrimeXTime (5.0/5), and all 6 are free to download.
-
Prime Ninja: Prime Numbers
-
Prime Pick
-
PrimeXTime
5.0
-
ぷにっと! ぷりん
-
97 – Prime Number Puzzle
-
Goldbach conjecture
| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| Sosu der | – | Free | August 2, 2026 | |
| Prime Ninja: Prime Numbers | – | Free | Sep 17, 2026 | Compare |
| Prime Pick | – | Free | Oct 19, 2026 | Compare |
| PrimeXTime | 5.0 / 5 (2) | Free | Jan 16, 2026 | Compare |
| ぷにっと! ぷりん | – | Free | Mar 31, 2026 | Compare |
| 97 – Prime Number Puzzle | – | Free | Jan 6, 2026 | Compare |
| Goldbach conjecture | – | Free | Aug 12, 2024 | Compare |
Compare Sosu der with the top alternatives: ratings, updates, ASO score and keyword gaps →