# 進数・補数変換 vs 歴検2級 過去問・暗記アプリ

The clearest difference is in-app purchases: 進数・補数変換 at none against 歴検2級 過去問・暗記アプリ's 3. 進数・補数変換 also leads on ads (none vs shown) and update cadence (weekly vs every 3 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. 歴検2級 過去問・暗記アプリ sells 3 one-off in-app purchases. 進数・補数変換 asks for nothing beyond the download.

進数・補数変換 ships an update weekly, 歴検2級 過去問・暗記アプリ every 3 weeks. The most recent releases landed on October 2, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | 進数・補数変換 | 歴検2級 過去問・暗記アプリ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Weekly** | Every 3 weeks |
| Size | 3 MB | 42 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Manato Abe](https://appshunter.io/developer/1766487879) | [Hajime App Lab](https://appshunter.io/developer/1704838092) |

## What reviewers say

### 進数・補数変換

[App page](https://appshunter.io/ios/app/id6702007723)

**Features:** macOS Compatibility

**In-app purchases:** none


### 歴検2級 過去問・暗記アプリ

[App page](https://appshunter.io/ios/app/2/id6793736734)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告削除 | $3.99 | one-time |
| 全問題解放 | $3.99 | one-time |
| 広告削除+全問題解放 | $5.99 | one-time |


## Frequently asked questions

### Is 進数・補数変換 free?

進数・補数変換 is free to download, with no in-app purchases.

### Is 歴検2級 過去問・暗記アプリ free?

歴検2級 過去問・暗記アプリ is free to download, with in-app purchases available.

### Do 進数・補数変換 or 歴検2級 過去問・暗記アプリ have ads?

歴検2級 過去問・暗記アプリ shows ads; 進数・補数変換 does not.

### Which is updated more often, 進数・補数変換 or 歴検2級 過去問・暗記アプリ?

進数・補数変換 ships an update weekly, and 歴検2級 過去問・暗記アプリ every 3 weeks. Most recently, 進数・補数変換 was updated on October 2, 2026 and 歴検2級 過去問・暗記アプリ on October 10, 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.*