# 错别字识别 vs AI Essay Optimization

The clearest difference is in-app purchases: 错别字识别 at none against AI Essay Optimization's 3. AI Essay Optimization's advantage is update cadence (every 6 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. AI Essay Optimization sells 3 in-app purchases, starting at $0.99 per 7 days. 错别字识别 asks for nothing beyond the download.

错别字识别 ships an update every 3 weeks, AI Essay Optimization every 6 days. The most recent releases landed on September 17, 2026 and March 14, 2026 respectively.

## The numbers

| Metric | 错别字识别 | AI Essay Optimization |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Size | 42 MB | 34 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [博宇 郝](https://appshunter.io/developer/1559676145) | [立元 赵](https://appshunter.io/developer/1286588316) |

## What reviewers say

### 错别字识别

[App page](https://appshunter.io/ios/app/id1622143170)

**In-app purchases:** none


### AI Essay Optimization

[App page](https://appshunter.io/ios/app/ai-essay-optimization/id6447417135)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One week | $0.99 | per 7 days |
| one month | $2.99 | per month |
| One year | $12.99 | per year |


## Frequently asked questions

### Is 错别字识别 free?

错别字识别 is free to download, with no in-app purchases.

### Is AI Essay Optimization free?

AI Essay Optimization is free to download, with in-app purchases available.

### Do 错别字识别 or AI Essay Optimization have ads?

Neither 错别字识别 nor AI Essay Optimization shows ads.

### Which is updated more often, 错别字识别 or AI Essay Optimization?

错别字识别 ships an update every 3 weeks, and AI Essay Optimization every 6 days. Most recently, 错别字识别 was updated on September 17, 2026 and AI Essay Optimization on March 14, 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.*