# A+伴学 vs 知了单词书

The clearest difference is in-app purchases: A+伴学 at none against 知了单词书's 1. 知了单词书's advantage is update cadence (every 5 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 知了单词书 sells 1 one-off in-app purchase. A+伴学 asks for nothing beyond the download.

A+伴学 ships an update every 2 months, 知了单词书 every 5 days. The most recent releases landed on October 14, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | A+伴学 | 知了单词书 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Size | 446 MB | 63 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [守强 梅](https://appshunter.io/developer/1467124718) | [重庆知竣文化传媒有限公司](https://appshunter.io/developer/1814794912) |

## What reviewers say

### A+伴学

[App page](https://appshunter.io/ios/app/a-plus/id1332551762)

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is A+伴学 free?

A+伴学 is free to download, with no in-app purchases.

### Is 知了单词书 free?

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

### Do A+伴学 or 知了单词书 have ads?

Neither A+伴学 nor 知了单词书 shows ads.

### Which is updated more often, A+伴学 or 知了单词书?

A+伴学 ships an update every 2 months, and 知了单词书 every 5 days. Most recently, A+伴学 was updated on October 14, 2026 and 知了单词书 on October 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.*