# 试卷橡皮擦 vs 足迹

The clearest difference is in-app purchases: 足迹 at none against 试卷橡皮擦's 3. 足迹 also leads on update cadence (every 2 days vs every 9 months) and iOS requirement (13.0 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. 试卷橡皮擦 sells 3 in-app purchases, starting at $2.99 per 7 days. 足迹 asks for nothing beyond the download.

试卷橡皮擦 ships an update every 9 months, 足迹 every 2 days. The most recent releases landed on October 16, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | 试卷橡皮擦 | 足迹 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 days** |
| Size | 30 MB | 313 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [枭雄 毛](https://appshunter.io/developer/1747634657) | [Xiamen Hanin Co.,Ltd.](https://appshunter.io/developer/1080883924) |

## What reviewers say

### 试卷橡皮擦

[App page](https://appshunter.io/ios/app/ai/id6749604691)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 慧写解题连续周会员 | $2.99 | per 7 days |
| 连续包月会员 | $3.99 | per month |
| 连续包季会员 | $7.99 | per 3 months |


### 足迹

[App page](https://appshunter.io/ios/app/id6775398737)

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

**In-app purchases:** none


## Frequently asked questions

### Is 试卷橡皮擦 free?

试卷橡皮擦 is free to download, with in-app purchases available.

### Is 足迹 free?

足迹 is free to download, with no in-app purchases.

### Do 试卷橡皮擦 or 足迹 have ads?

Neither 试卷橡皮擦 nor 足迹 shows ads.

### Which is updated more often, 试卷橡皮擦 or 足迹?

试卷橡皮擦 ships an update every 9 months, and 足迹 every 2 days. Most recently, 试卷橡皮擦 was updated on October 16, 2026 and 足迹 on October 11, 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.*