# Prime Factorization vs 素因数分解キングダム

The clearest difference is update cadence: 素因数分解キングダム at weekly against Prime Factorization's every 6 weeks. Prime Factorization's advantage is iOS requirement (7.1 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Prime Factorization ships an update every 6 weeks, 素因数分解キングダム weekly. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Prime Factorization | 素因数分解キングダム |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.5 (4 ratings)](https://appshunter.io/ios/app/prime-factorization-free-brain-training-game/id1062168263/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Weekly** |
| Monetization | Free | — |
| Size | 22 MB | 55 MB |
| Requires iOS | **7.1** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [NAKAYUBI CORPORATION](https://appshunter.io/developer/826300169) | [Yuta Matsuda](https://appshunter.io/developer/1788852960) |

## What reviewers say

### Prime Factorization

[App page](https://appshunter.io/ios/app/prime-factorization-free-brain-training-game/id1062168263)

This game challenges you to break down numbers into their prime factors until you reach one. It offers a simple yet engaging way to exercise your brain through number manipulation.

**Highlights:** Number factorization gameplay, Objective: reduce number to 1, Brain training exercises, Simple mechanics

**Features:** macOS Compatibility

**In-app purchases:** none


### 素因数分解キングダム

[App page](https://appshunter.io/ios/app/id6740195589)

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

**In-app purchases:** none


## Frequently asked questions

### Is Prime Factorization free?

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

### Is 素因数分解キングダム free?

素因数分解キングダム is free to download, with no in-app purchases.

### Do Prime Factorization or 素因数分解キングダム have ads?

Neither Prime Factorization nor 素因数分解キングダム shows ads.

### Which is updated more often, Prime Factorization or 素因数分解キングダム?

Prime Factorization ships an update every 6 weeks, and 素因数分解キングダム weekly. Most recently, Prime Factorization was updated on November 2, 2026 and 素因数分解キングダム on October 30, 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.*