# 瞬間素因数分解 Prime Factorization vs Kifu Vault

The clearest difference is price: 瞬間素因数分解 Prime Factorization at Free against Kifu Vault's $5.99. Kifu Vault's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

瞬間素因数分解 Prime Factorization is free to download; Kifu Vault costs $5.99 up front. 瞬間素因数分解 Prime Factorization sells 1 one-off in-app purchase. Kifu Vault asks for nothing beyond the download.

瞬間素因数分解 Prime Factorization ships an update weekly, Kifu Vault daily. The most recent releases landed on October 25, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | 瞬間素因数分解 Prime Factorization | Kifu Vault |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| Positive reviews | — | 60.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Weekly | **Daily** |
| Monetization | — | Paid |
| Size | 3 MB | 6 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [YUSUKE MIZUNO](https://appshunter.io/developer/1729948508) | [suzuki hajime](https://appshunter.io/developer/6795305454) |

## What reviewers say

### 瞬間素因数分解 Prime Factorization

[App page](https://appshunter.io/ios/app/prime-factorization/id6478605149)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ad | $1.99 | one-time |


### Kifu Vault

[App page](https://appshunter.io/ios/app/kifu-vault/id6795305452)

This app helps you store, search, and review your Shogi game records. It turns lessons into quizzes, tracks your progress, and allows for detailed game analysis and organization. All data is saved locally for privacy and offline access.

**Highlights:** Store and search Shogi game records, Turn lessons into 'next move' quizzes, Spaced repetition for quiz learning, Import existing game records, Detailed game analysis and annotation, Offline functionality, Printable game records

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

**In-app purchases:** none


## Frequently asked questions

### Is 瞬間素因数分解 Prime Factorization free?

瞬間素因数分解 Prime Factorization is free to download, with in-app purchases available.

### Is Kifu Vault free?

Kifu Vault costs $5.99, with no in-app purchases.

### Do 瞬間素因数分解 Prime Factorization or Kifu Vault have ads?

瞬間素因数分解 Prime Factorization shows ads; Kifu Vault does not.

### Which is updated more often, 瞬間素因数分解 Prime Factorization or Kifu Vault?

瞬間素因数分解 Prime Factorization ships an update weekly, and Kifu Vault daily. Most recently, 瞬間素因数分解 Prime Factorization was updated on October 25, 2026 and Kifu Vault on November 1, 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.*