# 小牛错题本 vs 繁墨云题库

The clearest difference is in-app purchases: 繁墨云题库 at none against 小牛错题本's 4. 小牛错题本's advantage is iOS requirement (12.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 小牛错题本 sells 4 in-app purchases, starting at $2.99 per month. 繁墨云题库 asks for nothing beyond the download.

小牛错题本 ships an update monthly, 繁墨云题库 every 6 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | 小牛错题本 | 繁墨云题库 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Monthly** | Every 6 weeks |
| Size | 105 MB | 33 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [深圳市云领天下科技有限公司](https://appshunter.io/developer/725440563) | [Xi'an Gravity Fluctuation Technology Co., Ltd.](https://appshunter.io/developer/1815183224) |

## What reviewers say

### 小牛错题本

[App page](https://appshunter.io/ios/app/id6474232623)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 小牛错题本连续包月（1个月） | $2.99 | per month |
| 小牛错题本连续包季（3个月） | $5.99 | per 3 months |
| 小牛错题本会员1个月 | $3.99 | one-time |
| 小牛错题本会员6个月 | $14.99 | one-time |


### 繁墨云题库

[App page](https://appshunter.io/ios/app/id6746106014)

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

**In-app purchases:** none


## Frequently asked questions

### Is 小牛错题本 free?

小牛错题本 is free to download, with in-app purchases available.

### Is 繁墨云题库 free?

繁墨云题库 is free to download, with no in-app purchases.

### Do 小牛错题本 or 繁墨云题库 have ads?

Neither 小牛错题本 nor 繁墨云题库 shows ads.

### Which is updated more often, 小牛错题本 or 繁墨云题库?

小牛错题本 ships an update monthly, and 繁墨云题库 every 6 weeks. Most recently, 小牛错题本 was updated on October 24, 2026 and 繁墨云题库 on October 24, 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.*