# 書房 vs 墨間

The clearest difference is in-app purchases: 書房 at none against 墨間's 1. 墨間's advantage is iOS requirement (15.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 墨間 sells 1 one-off in-app purchase. 書房 asks for nothing beyond the download.

書房 ships an update every 3 days, 墨間 every 4 days. The most recent releases landed on October 31, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | 書房 | 墨間 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 4 days |
| Size | 9 MB | 62 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [ZEYAN LIN](https://appshunter.io/developer/6785373009) | [Kong NG](https://appshunter.io/developer/6806903600) |

## What reviewers say

### 書房

[App page](https://appshunter.io/ios/app/id6798525550)

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

**In-app purchases:** none


### 墨間

[App page](https://appshunter.io/ios/app/id6806903598)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 墨間進階版 | $4.99 | one-time |


## Frequently asked questions

### Is 書房 free?

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

### Is 墨間 free?

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

### Do 書房 or 墨間 have ads?

Neither 書房 nor 墨間 shows ads.

### Which is updated more often, 書房 or 墨間?

書房 ships an update every 3 days, and 墨間 every 4 days. Most recently, 書房 was updated on October 31, 2026 and 墨間 on November 6, 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.*