# PRIDO vs 小牛错题本

The clearest difference is in-app purchases: PRIDO at none against 小牛错题本's 4. PRIDO also leads on iOS requirement (10.0 vs 12.0). 小牛错题本's advantage is device support. On price 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. PRIDO asks for nothing beyond the download.

## The numbers

| Metric | PRIDO | 小牛错题本 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | No |
| Update frequency | — | Monthly |
| Size | 83 MB | 105 MB |
| Requires iOS | **10.0** | 12.0 |
| Devices | — | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [理才 罗](https://appshunter.io/developer/1583878869) | [深圳市云领天下科技有限公司](https://appshunter.io/developer/725440563) |

## What reviewers say

### PRIDO

[App page](https://appshunter.io/ios/app/prido/id1663113235)

**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 PRIDO free?

PRIDO 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.

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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.*