# 时间书 vs Dozora

The clearest difference is in-app purchases: Dozora at none against 时间书's 4. Dozora also leads on iOS requirement (13.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 时间书 sells 4 one-off in-app purchases. Dozora asks for nothing beyond the download.

时间书 ships an update monthly, Dozora every 3 weeks. The most recent releases landed on October 24, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | 时间书 | Dozora |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Size | 33 MB | 65 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [和柳 郑](https://appshunter.io/developer/1664971686) | [平 王](https://appshunter.io/developer/1741278980) |

## What reviewers say

### 时间书

[App page](https://appshunter.io/ios/app/id6448215756)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 时间书月会员 | $0.99 | one-time |
| 时间书标签配额 | $0.99 | one-time |
| 时间书年度会员 | $6.99 | one-time |
| 时间书三年会员 | $14.99 | one-time |


### Dozora

[App page](https://appshunter.io/ios/app/dozora-sleep-tracker/id6762412999)

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

**In-app purchases:** none


## Frequently asked questions

### Is 时间书 free?

时间书 is free to download, with in-app purchases available.

### Is Dozora free?

Dozora is free to download, with no in-app purchases.

### Do 时间书 or Dozora have ads?

Neither 时间书 nor Dozora shows ads.

### Which is updated more often, 时间书 or Dozora?

时间书 ships an update monthly, and Dozora every 3 weeks. Most recently, 时间书 was updated on October 24, 2026 and Dozora on October 14, 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.*