# 知了单词书 vs 阿布背单词

The clearest difference is update cadence: 知了单词书 at every 5 days against 阿布背单词's every 3 weeks. 知了单词书 also leads on device support (3 vs 1) and iOS requirement (12.0 vs 16.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. 知了单词书 sells 1 one-off in-app purchase and 阿布背单词 sells 3 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

知了单词书 ships an update every 5 days, 阿布背单词 every 3 weeks. Both last shipped on October 30, 2026.

## The numbers

| Metric | 知了单词书 | 阿布背单词 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (6 ratings)](https://appshunter.io/ios/app/ai/id6747030390/reviews)** |
| Number of ratings | — | **6** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 3 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 63 MB | 6 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [重庆知竣文化传媒有限公司](https://appshunter.io/developer/1814794912) | [Xin Chen](https://appshunter.io/developer/425936137) |

## What reviewers say

### 知了单词书

[App page](https://appshunter.io/ios/app/id6746037035)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 知了1年会员 | $39.99 | one-time |


### 阿布背单词

[App page](https://appshunter.io/ios/app/ai/id6747030390)

Learn languages with engaging stories and an AI tutor. This app uses narrative memory techniques to make vocabulary acquisition fun and effective. Practice speaking and writing with AI feedback to improve fluency and accuracy.

**Highlights:** Story-based vocabulary memorization, AI foreign language tutor, AI deep word analysis, Interactive reading and dictation, Exam and daily phrase libraries, Synonym comparison practice

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $0.99 | per 7 days |
| Monthly Premium | $2.99 | per month |
| 包年VIP会员 | $19.99 | per year |


## Frequently asked questions

### Is 知了单词书 free?

知了单词书 is free to download, with in-app purchases available.

### Is 阿布背单词 free?

阿布背单词 is free to download, with in-app purchases available.

### Do 知了单词书 or 阿布背单词 have ads?

Neither 知了单词书 nor 阿布背单词 shows ads.

### Which is updated more often, 知了单词书 or 阿布背单词?

知了单词书 ships an update every 5 days, and 阿布背单词 every 3 weeks. Most recently, 知了单词书 was updated on October 30, 2026 and 阿布背单词 on October 30, 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.*