# 洋葱学园 vs 错题星

The clearest difference is ads: 错题星 at none against 洋葱学园's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. 洋葱学园 sells 12 one-off in-app purchases and 错题星 sells 15 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

洋葱学园 ships an update fortnightly, 错题星 every 3 weeks. The most recent releases landed on September 26, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | 洋葱学园 | 错题星 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (91 ratings)](https://appshunter.io/ios/app/id990959871/reviews)** | — |
| Number of ratings | **91** | — |
| Positive reviews | 65.9% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 122 MB | 95 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Guanghe](https://appshunter.io/developer/990959870) | [武汉未来之星人工智能科技有限公司](https://appshunter.io/developer/1770241827) |

## What reviewers say

### 洋葱学园

[App page](https://appshunter.io/ios/app/id990959871)

This platform offers animated online courses for K-12 students covering math, physics, and other subjects. It features AI-powered personalized learning plans, instant AI tutor support for questions, and a unique photo-based problem-solving tool that teaches concepts before providing solutions. The goal is to help students quickly grasp difficult concepts and improve their academic performance.

**Highlights:** AI personalized learning plans, Animated AI tutor for instant Q&A, Photo-based problem-solving with concept explanation, Animated courses for math and physics, Gamified learning mechanisms

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

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 洋葱课程 | $0.99 | one-time |
| 6个月高中数学洋葱课程 | $21.99 | one-time |
| 3个月初中数学洋葱课程 | $29.99 | one-time |
| 3个月高中数学洋葱课程 | $29.99 | one-time |
| 3个月初中物理洋葱课程 | $29.99 | one-time |
| 洋葱课程 | $29.99 | one-time |
| 12个月初中物理洋葱课程 | $37.99 | one-time |
| 洋葱课程 | $39.99 | one-time |
| 6个月初中数学洋葱课程 | $46.99 | one-time |
| 12个月初中数学洋葱课程 | $69.99 | one-time |
| 洋葱课程 | $69.99 | one-time |
| 洋葱课程 | $99.99 | one-time |


### 错题星

[App page](https://appshunter.io/ios/app/ai/id1602483511)

**Features:** macOS Compatibility

**In-app purchases (15)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1个月会员 | $3.99 | one-time |
| 12个月会员（优惠） | $26.99 | one-time |
| 1年会员（原价） | $29.99 | one-time |
| 2年会员（原价） | $39.99 | one-time |
| 12个月SVIP | $39.99 | one-time |
| 36个月会员（优惠） | $46.99 | one-time |
| 48个月SVIP | $59.99 | one-time |
| 72个月SVIP | $59.99 | one-time |
| 72个月VIP | $59.99 | one-time |
| 60个月SVIP | $59.99 | one-time |
| 96个月SVIP | $69.99 | one-time |
| 108个月SVIP | $69.99 | one-time |
| 36个月 | $109.99 | one-time |
| 终身SVIP（优惠） | $149.99 | one-time |
| 终身SVIP | $399.99 | one-time |


## Frequently asked questions

### Is 洋葱学园 free?

洋葱学园 is free to download, with in-app purchases available.

### Is 错题星 free?

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

### Do 洋葱学园 or 错题星 have ads?

洋葱学园 shows ads; 错题星 does not.

### Which is updated more often, 洋葱学园 or 错题星?

洋葱学园 ships an update fortnightly, and 错题星 every 3 weeks. Most recently, 洋葱学园 was updated on September 26, 2026 and 错题星 on September 9, 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.*