# Sosu der vs Prime Nerd

The clearest difference is update cadence: Prime Nerd at every 3 days against Sosu der's every 4 months. Sosu der's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

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 Nerd every 3 days. The most recent releases landed on October 17, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Sosu der | Prime Nerd |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 4 months | **Every 3 days** |
| Monetization | — | Ad-supported |
| Size | 140 MB | 50 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hirobumi Onishi](https://appshunter.io/developer/1740115066) | [Hiroki Sekimoto](https://appshunter.io/developer/1877884860) |

## 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


### Prime Nerd

[App page](https://appshunter.io/ios/app/prime-nerd/id6760544446)

Tap prime numbers as they float across the screen within a time limit. This speed math game offers multiple difficulty levels, a combo system for score multipliers, and a training mode to hone your skills. Compete globally on the leaderboard and customize your challenge with digit selection.

**Highlights:** Identify prime numbers, Timed challenges, Global leaderboard, Multiple difficulty levels, Combo score multiplier, Training mode, Dark/Light theme

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

**In-app purchases:** none


## Frequently asked questions

### Is Sosu der free?

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

### Is Prime Nerd free?

Prime Nerd is free to download, with no in-app purchases.

### Do Sosu der or Prime Nerd have ads?

Both Sosu der and Prime Nerd show ads.

### Which is updated more often, Sosu der or Prime Nerd?

Sosu der ships an update every 4 months, and Prime Nerd every 3 days. Most recently, Sosu der was updated on October 17, 2026 and Prime Nerd on October 11, 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.*