# ZhiGe vs AI错题树

ZhiGe and AI错题树 are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. ZhiGe sells 7 in-app purchases, starting at $0.99 per month and AI错题树 sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ZhiGe ships an update every 10 days, AI错题树 weekly. Both last shipped on October 24, 2026.

## The numbers

| Metric | ZhiGe | 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 | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 42 MB | 48 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [良玉 侯](https://appshunter.io/developer/1879665668) | [南京五脉生物科技有限公司](https://appshunter.io/developer/6771737025) |

## What reviewers say

### ZhiGe

[App page](https://appshunter.io/ios/app/zhige/id6759592391)

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic Monthly | $0.99 | per month |
| Pro Monthly | $1.99 | per month |
| Basic Annual | $14.99 | per year |
| Pro Annual | $22.99 | per year |
| Starter Pack | $0.99 | one-time |
| Standard Pack | $1.99 | one-time |
| Pro Pack | $4.99 | one-time |


### 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 ZhiGe free?

ZhiGe is free to download, with in-app purchases available.

### Is AI错题树 free?

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

### Do ZhiGe or AI错题树 have ads?

Neither ZhiGe nor AI错题树 shows ads.

### Which is updated more often, ZhiGe or AI错题树?

ZhiGe ships an update every 10 days, and AI错题树 weekly. Most recently, ZhiGe was updated on October 24, 2026 and AI错题树 on October 24, 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.*