# こどもサイズ帳 vs ぼくのもじ

The clearest difference is in-app purchases: こどもサイズ帳 at none against ぼくのもじ's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. ぼくのもじ sells 2 one-off in-app purchases. こどもサイズ帳 asks for nothing beyond the download.

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | こどもサイズ帳 | ぼくのもじ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Size | 10 MB | 61 MB |
| Requires iOS | **17.6** | 18.6 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Mami Kawai](https://appshunter.io/developer/1890495943) | [Nagatomo Miki](https://appshunter.io/developer/1891189762) |

## What reviewers say

### こどもサイズ帳

[App page](https://appshunter.io/ios/app/id6767790620)

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

**In-app purchases:** none


### ぼくのもじ

[App page](https://appshunter.io/ios/app/id6800529422)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| コーヒー1杯の応援 | $0.99 | one-time |
| カフェラテ1杯の応援 | $1.99 | one-time |


## Frequently asked questions

### Is こどもサイズ帳 free?

こどもサイズ帳 is free to download, with no in-app purchases.

### Is ぼくのもじ free?

ぼくのもじ is free to download, with in-app purchases available.

### Do こどもサイズ帳 or ぼくのもじ have ads?

Neither こどもサイズ帳 nor ぼくのもじ shows ads.

### Which is updated more often, こどもサイズ帳 or ぼくのもじ?

こどもサイズ帳 ships an update fortnightly, and ぼくのもじ fortnightly. Most recently, こどもサイズ帳 was updated on October 25, 2026 and ぼくのもじ on October 24, 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.*