# 书中课堂 vs Delta单词

The clearest difference is in-app purchases: Delta单词 at none against 书中课堂's 8. Delta单词 also leads on update cadence (daily vs monthly). 书中课堂's advantage is iOS requirement (9.3 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. 书中课堂 sells 8 one-off in-app purchases. Delta单词 asks for nothing beyond the download.

书中课堂 ships an update monthly, Delta单词 daily. The most recent releases landed on September 19, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | 书中课堂 | Delta单词 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/id1005029377/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Daily** |
| Size | 47 MB | 180 MB |
| Requires iOS | **9.3** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hangzhou Dayread Communications Co., Ltd.](https://appshunter.io/developer/1005029376) | [田丰 何](https://appshunter.io/developer/1674464316) |

## What reviewers say

### 书中课堂

[App page](https://appshunter.io/ios/app/id1005029377)

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1DayreadCoin | $0.99 | one-time |
| 6DayreadCoin | $0.99 | one-time |
| 45DayreadCoin | $6.99 | one-time |
| 68DayreadCoin | $9.99 | one-time |
| 118DayreadCoin | $17.99 | one-time |
| 198DayreadCoin | $29.99 | one-time |
| 348DayreadCoin | $54.99 | one-time |
| 648DayreadCoin | $99.99 | one-time |


### Delta单词

[App page](https://appshunter.io/ios/app/delta/id6744654342)

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

**In-app purchases:** none


## Frequently asked questions

### Is 书中课堂 free?

书中课堂 is free to download, with in-app purchases available.

### Is Delta单词 free?

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

### Do 书中课堂 or Delta单词 have ads?

Neither 书中课堂 nor Delta单词 shows ads.

### Which is updated more often, 书中课堂 or Delta单词?

书中课堂 ships an update monthly, and Delta单词 daily. Most recently, 书中课堂 was updated on September 19, 2026 and Delta单词 on September 8, 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.*