# 错题本·学伴 vs 稳了!

The clearest difference is device support: 稳了! at 2 against 错题本·学伴's —. 稳了! also leads on iOS requirement (13.0 vs 15.0). On price and in-app purchases 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 and 稳了! sells 1 in-app purchase, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | 错题本·学伴 | 稳了! |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | — | No |
| Update frequency | — | Daily |
| Size | 8 MB | 30 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | — | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [大勇 阎](https://appshunter.io/developer/1068052430) | [探渊科技](https://appshunter.io/developer/1814267710) |

## What reviewers say

### 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 |


### 稳了!

[App page](https://appshunter.io/ios/app/ai/id6754680276)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月度订阅 | $2.99 | per month |


## Frequently asked questions

### Is 错题本·学伴 free?

错题本·学伴 is free to download, with in-app purchases available.

### Is 稳了! free?

稳了! 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.*