# Nook Letter vs ウチの子ID｜ペットの健康手帳

The clearest difference is update cadence: ウチの子ID｜ペットの健康手帳 at daily against Nook Letter's every 2 weeks. Nook Letter's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 16.4). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Nook Letter sells 2 in-app purchases, starting at $1.99 per month and ウチの子ID｜ペットの健康手帳 sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Nook Letter ships an update every 2 weeks, ウチの子ID｜ペットの健康手帳 daily. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Nook Letter | ウチの子ID｜ペットの健康手帳 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Daily** |
| Size | 88 MB | 87 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [YUYA MIYAZAKI](https://appshunter.io/developer/1878926763) | [HIROKI NIIYAMA](https://appshunter.io/developer/1867050101) |

## What reviewers say

### Nook Letter

[App page](https://appshunter.io/ios/app/nook-letter/id6762508911)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Nook　プレミアムプラン | $1.99 | per month |
| 秘密の切手 | $0.49 | one-time |


### ウチの子ID｜ペットの健康手帳

[App page](https://appshunter.io/ios/app/id/id6777766873)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Proプラン（月額） | $1.99 | per month |
| Proプラン（年額） | $22.99 | per year |


## Frequently asked questions

### Is Nook Letter free?

Nook Letter is free to download, with in-app purchases available.

### Is ウチの子ID｜ペットの健康手帳 free?

ウチの子ID｜ペットの健康手帳 is free to download, with in-app purchases available.

### Do Nook Letter or ウチの子ID｜ペットの健康手帳 have ads?

Neither Nook Letter nor ウチの子ID｜ペットの健康手帳 shows ads.

### Which is updated more often, Nook Letter or ウチの子ID｜ペットの健康手帳?

Nook Letter ships an update every 2 weeks, and ウチの子ID｜ペットの健康手帳 daily. Most recently, Nook Letter was updated on October 28, 2026 and ウチの子ID｜ペットの健康手帳 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.*