# 小禾故事 vs AI错题树

The clearest difference is in-app purchases: 小禾故事 at none against AI错题树's 3. AI错题树's advantage is update cadence (every 9 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. AI错题树 sells 3 one-off in-app purchases. 小禾故事 asks for nothing beyond the download.

小禾故事 ships an update every 2 months, AI错题树 every 9 days. The most recent releases landed on October 17, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | 小禾故事 | AI错题树 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ai/id6771737023/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 9 days** |
| Monetization | — | Free with in-app purchases |
| Size | 37 MB | 45 MB |
| Requires iOS | **15.6** | 16.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [乔羚 李](https://appshunter.io/developer/1877233797) | [南京五脉生物科技有限公司](https://appshunter.io/developer/6771737025) |

## What reviewers say

### 小禾故事

[App page](https://appshunter.io/ios/app/ai/id6761818294)

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

**In-app purchases:** none


### AI错题树

[App page](https://appshunter.io/ios/app/ai/id6771737023)

Effortlessly capture and analyze your mistakes from tests and homework using AI. Organize errors by subject and type, receive correct problem-solving approaches, and track your learning progress to identify weak areas.

**Highlights:** Photo upload for questions and test papers, AI error diagnosis and correction guidance, Organize mistakes by subject and error type, Track learning progress and identify weak areas, Privacy protection with local AI analysis

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 100 AI calls | $0.99 | one-time |
| 1000 AI Calls | $4.99 | one-time |
| 5000 AI Calls | $24.99 | one-time |


## Frequently asked questions

### Is 小禾故事 free?

小禾故事 is free to download, with no in-app purchases.

### Is AI错题树 free?

AI错题树 is free to download, with in-app purchases available.

### Do 小禾故事 or AI错题树 have ads?

Neither 小禾故事 nor AI错题树 shows ads.

### Which is updated more often, 小禾故事 or AI错题树?

小禾故事 ships an update every 2 months, and AI错题树 every 9 days. Most recently, 小禾故事 was updated on October 17, 2026 and AI错题树 on October 8, 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.*