# 云机械商户版 vs 小牛错题本

The clearest difference is in-app purchases: 云机械商户版 at none against 小牛错题本's 4. 云机械商户版 also leads on update cadence (every 2 weeks vs monthly) and iOS requirement (8.1 vs 12.0). On price, 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. 云机械商户版 asks for nothing beyond the download.

云机械商户版 ships an update every 2 weeks, 小牛错题本 monthly. The most recent releases landed on November 2, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 云机械商户版 | 小牛错题本 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Monthly |
| Size | 79 MB | 105 MB |
| Requires iOS | **8.1** | 12.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [浙江聚励云机械科技有限公司](https://appshunter.io/developer/973328686) | [深圳市云领天下科技有限公司](https://appshunter.io/developer/725440563) |

## What reviewers say

### 云机械商户版

[App page](https://appshunter.io/ios/app/id1352261385)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is 云机械商户版 free?

云机械商户版 is free to download, with no in-app purchases.

### Is 小牛错题本 free?

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

### Do 云机械商户版 or 小牛错题本 have ads?

Neither 云机械商户版 nor 小牛错题本 shows ads.

### Which is updated more often, 云机械商户版 or 小牛错题本?

云机械商户版 ships an update every 2 weeks, and 小牛错题本 monthly. Most recently, 云机械商户版 was updated on November 2, 2026 and 小牛错题本 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.*