# しおりっぷ vs 空港コード暗記：３レターマスター!

The clearest difference is in-app purchases: しおりっぷ at none against 空港コード暗記：３レターマスター!'s 2. しおりっぷ also leads on update cadence (every 3 weeks vs every 6 weeks) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. 空港コード暗記：３レターマスター! sells 2 one-off in-app purchases. しおりっぷ asks for nothing beyond the download.

しおりっぷ ships an update every 3 weeks, 空港コード暗記：３レターマスター! every 6 weeks. The most recent releases landed on October 25, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | しおりっぷ | 空港コード暗記：３レターマスター! |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Size | 70 MB | 27 MB |
| Requires iOS | **15.6** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Bouzer LLC](https://appshunter.io/developer/1809286489) | [Ayumu Izumi](https://appshunter.io/developer/1822273057) |

## What reviewers say

### しおりっぷ

[App page](https://appshunter.io/ios/app/id6740020904)

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

**In-app purchases:** none


### 空港コード暗記：３レターマスター!

[App page](https://appshunter.io/ios/app/id6749082421)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告の完全削除のみ | $1.99 | one-time |
| アップグレード版 | $2.99 | one-time |


## Frequently asked questions

### Is しおりっぷ free?

しおりっぷ is free to download, with no in-app purchases.

### Is 空港コード暗記：３レターマスター! free?

空港コード暗記：３レターマスター! is free to download, with in-app purchases available.

### Do しおりっぷ or 空港コード暗記：３レターマスター! have ads?

Both しおりっぷ and 空港コード暗記：３レターマスター! show ads.

### Which is updated more often, しおりっぷ or 空港コード暗記：３レターマスター!?

しおりっぷ ships an update every 3 weeks, and 空港コード暗記：３レターマスター! every 6 weeks. Most recently, しおりっぷ was updated on October 25, 2026 and 空港コード暗記：３レターマスター! 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.*