# 英検®2級予想問題ドリル vs 瞬間素因数分解 Prime Factorization

The clearest difference is price: 瞬間素因数分解 Prime Factorization at Free against 英検®2級予想問題ドリル's $4.99. 瞬間素因数分解 Prime Factorization also leads on update cadence (weekly vs every 21 months). 英検®2級予想問題ドリル'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; 英検®2級予想問題ドリル costs $4.99 up front. 瞬間素因数分解 Prime Factorization sells 1 one-off in-app purchase. 英検®2級予想問題ドリル asks for nothing beyond the download.

英検®2級予想問題ドリル ships an update every 21 months, 瞬間素因数分解 Prime Factorization weekly. The most recent releases landed on September 11, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | 英検®2級予想問題ドリル | 瞬間素因数分解 Prime Factorization |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 21 months | **Weekly** |
| Size | 30 MB | 3 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [StudySwitch, Inc.](https://appshunter.io/developer/1368900403) | [YUSUKE MIZUNO](https://appshunter.io/developer/1729948508) |

## What reviewers say

### 英検®2級予想問題ドリル

[App page](https://appshunter.io/ios/app/2/id1368900404)

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is 英検®2級予想問題ドリル free?

英検®2級予想問題ドリル costs $4.99, with no in-app purchases.

### 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.

### Do 英検®2級予想問題ドリル or 瞬間素因数分解 Prime Factorization have ads?

瞬間素因数分解 Prime Factorization shows ads; 英検®2級予想問題ドリル does not.

### Which is updated more often, 英検®2級予想問題ドリル or 瞬間素因数分解 Prime Factorization?

英検®2級予想問題ドリル ships an update every 21 months, and 瞬間素因数分解 Prime Factorization weekly. Most recently, 英検®2級予想問題ドリル was updated on September 11, 2026 and 瞬間素因数分解 Prime Factorization on September 21, 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.*