# 知识树 vs Card Master

The clearest difference is rating: Card Master at 5.0 against 知识树's 4.2. Card Master also leads on in-app purchases (none vs 4). 知识树's advantage is update cadence (every 5 days vs every 3 weeks) and ratings volume (5 vs 1). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 知识树 sells 4 in-app purchases, starting at $2.99 per month. Card Master asks for nothing beyond the download.

Card Master holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: 知识树 has 5 ratings behind it against 1, so its average is the more settled of the two.

知识树 ships an update every 5 days, Card Master every 3 weeks. The most recent releases landed on October 6, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | 知识树 | Card Master |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (5 ratings)](https://appshunter.io/ios/app/ai/id6505133670/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/card-master/id6739202007/reviews)** |
| Number of ratings | **5** | 1 |
| Positive reviews | 38.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 3 weeks |
| Monetization | Freemium | **Free** |
| Size | 2 MB | 22 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [野 匡](https://appshunter.io/developer/819954894) | [秀娟 牛](https://appshunter.io/developer/1094634955) |

## What reviewers say

### 知识树

[App page](https://appshunter.io/ios/app/ai/id6505133670)

This intelligent learning system uses AI to understand knowledge, break down concepts, and dynamically schedule practice and review based on your memory state. It focuses on true retention through spaced repetition and scientific memory curves, not just completing exercises.

**Highlights:** AI-driven knowledge understanding, Dynamic practice and review scheduling, Breakdown of knowledge into testable points, Spaced repetition for long-term memory, Automatic assessment of mastery, Progress tracking over speed

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月度会员 | $2.99 | per month |
| 季度会员 | $4.99 | per 3 months |
| 年度会员 | $19.99 | per year |
| 终身会员 | $24.99 | one-time |


### Card Master

[App page](https://appshunter.io/ios/app/card-master/id6739202007)

This intelligent learning assistant uses a scientific memory algorithm based on the forgetting curve model to schedule personalized review sessions. It supports rich media notes, LaTeX, and code blocks, making it ideal for students, language learners, and professionals.

**Highlights:** Scientific memory algorithm (SM2), Personalized review scheduling, Import Anki files (.apkg), Multi-dimensional note management, Rich media support (images, audio, video), LaTeX equation editor, Code highlighting

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 知识树 free?

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

### Is Card Master free?

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

### Which has better reviews, 知识树 or Card Master?

Card Master is rated higher. 知识树 averages 4.2 out of 5 from 5 ratings, while Card Master averages 5.0 from 1 ratings.

### Do 知识树 or Card Master have ads?

Neither 知识树 nor Card Master shows ads.

### Which is updated more often, 知识树 or Card Master?

知识树 ships an update every 5 days, and Card Master every 3 weeks. Most recently, 知识树 was updated on October 6, 2026 and Card Master on October 5, 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.*