# SOINSU math puzzle vs QA²

The clearest difference is review sentiment: SOINSU math puzzle at 90% against QA²'s 50%. SOINSU math puzzle also leads on update cadence (weekly vs every 3 weeks) and iOS requirement (12.0 vs 15.0). QA²'s advantage is in-app purchases (none vs 2) and ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. SOINSU math puzzle sells 2 one-off in-app purchases. QA² asks for nothing beyond the download.

SOINSU math puzzle ships an update weekly, QA² every 3 weeks. The most recent releases landed on October 17, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | SOINSU math puzzle | QA² |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **90.0% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 3 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 105 MB | 180 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [GAIBAKO co., Ltd.](https://appshunter.io/developer/1548482925) | [TISI Incorporated](https://appshunter.io/developer/463993929) |

## 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 |


### QA²

[App page](https://appshunter.io/ios/app/qa/id6747648497)

Engage in a unique puzzle game set in the quantum world. Swipe and match colorful blocks to create satisfying chain reactions and master various game modes. Challenge AI opponents and compete on global leaderboards.

**Highlights:** Quantum-themed puzzle gameplay, Satisfying chain reaction system, Multiple game modes (Rush, Depth, Flow, Overload), VS AI mode with challenging opponents, Global leaderboards for competitive play, Brain training mechanics

**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 QA² free?

QA² is free to download, with no in-app purchases.

### Do SOINSU math puzzle or QA² have ads?

SOINSU math puzzle shows ads; QA² does not.

### Which is updated more often, SOINSU math puzzle or QA²?

SOINSU math puzzle ships an update weekly, and QA² every 3 weeks. Most recently, SOINSU math puzzle was updated on October 17, 2026 and QA² on October 12, 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.*