# 研路大川 vs 错题本·学伴

The clearest difference is in-app purchases: 研路大川 at none against 错题本·学伴's 2. 研路大川 also leads on device support and iOS requirement (12.0 vs 15.0). On price there is nothing between them.

Both are free to download. 错题本·学伴 sells 2 in-app purchases, starting at $2.99 per month. 研路大川 asks for nothing beyond the download.

## The numbers

| Metric | 研路大川 | 错题本·学伴 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | — |
| Update frequency | Every 2 months | — |
| Size | 161 MB | 8 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [北京万学教育科技有限公司](https://appshunter.io/developer/1044531538) | [大勇 阎](https://appshunter.io/developer/1068052430) |

## What reviewers say

### 研路大川

[App page](https://appshunter.io/ios/app/id1514073932)

**In-app purchases:** none


### 错题本·学伴

[App page](https://appshunter.io/ios/app/id6448768023)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 包月 | $2.99 | per month |
| 包年 | $24.99 | per year |


## Frequently asked questions

### Is 研路大川 free?

研路大川 is free to download, with no in-app purchases.

### Is 错题本·学伴 free?

错题本·学伴 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.*