# SOINSU math puzzle vs Prime Nerd

The clearest difference is review sentiment: SOINSU math puzzle at 90% against Prime Nerd's 0%. SOINSU math puzzle also leads on device support (3 vs 1) and iOS requirement (12.0 vs 17.0). Prime Nerd's advantage is in-app purchases (none vs 2) and update cadence (every 3 days vs weekly). On price and ads there is nothing between them.

Both are free to download. SOINSU math puzzle sells 2 one-off in-app purchases. Prime Nerd asks for nothing beyond the download.

SOINSU math puzzle ships an update weekly, Prime Nerd every 3 days. The most recent releases landed on October 21, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | SOINSU math puzzle | Prime Nerd |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **90.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Weekly | **Every 3 days** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 105 MB | 50 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [GAIBAKO co., Ltd.](https://appshunter.io/developer/1548482925) | [Hiroki Sekimoto](https://appshunter.io/developer/1877884860) |

## What reviewers say

### SOINSU math puzzle

[App page](https://appshunter.io/ios/app/soinsu-math-puzzle/id6444055103)

Engage in a brain-training puzzle game focused on prime factorization. Anyone can learn the fun of numbers through this simple, time-killing activity. Enjoy the challenge of dividing numbers into prime factors with a high-tempo soundtrack.

**Highlights:** Prime factorization gameplay, Brain training puzzles, Mental arithmetic practice, Cyber visuals, Trance music soundtrack, Multiple game modes, Prime number collection

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Add no time limit mode | $0.99 | one-time |
| Hidden Ads | $2.99 | one-time |


### 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 SOINSU math puzzle free?

SOINSU math puzzle is free to download, with in-app purchases available.

### Is Prime Nerd free?

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

### Do SOINSU math puzzle or Prime Nerd have ads?

Both SOINSU math puzzle and Prime Nerd show ads.

### Which is updated more often, SOINSU math puzzle or Prime Nerd?

SOINSU math puzzle ships an update weekly, and Prime Nerd every 3 days. Most recently, SOINSU math puzzle was updated on October 21, 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.*