# 知识树 vs Multiply Fun

The clearest difference is rating: Multiply Fun at 5.0 against 知识树's 4.2. 知识树's advantage is review sentiment (39% vs 0%) and ads (none vs shown). On price, ratings volume, in-app purchases and monetization model there is nothing between them.

Both are free to download. 知识树 sells 4 in-app purchases, starting at $2.99 per month and Multiply Fun sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Multiply Fun holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 5 and 5 respectively. Written reviews complicate that: 39% of 知识树's written reviews are positive against 0% of Multiply Fun's, so the app with the better star average is not the one people write more warmly about.

知识树 ships an update every 5 days, Multiply Fun every 4 weeks. The most recent releases landed on October 6, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | 知识树 | Multiply Fun |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (5 ratings)](https://appshunter.io/ios/app/ai/id6505133670/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/multiply-fun-19x19-lite/id6738623083/reviews)** |
| Number of ratings | 5 | 5 |
| Positive reviews | **38.9% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 5 days** | Every 4 weeks |
| Monetization | Freemium | Free with in-app purchases |
| Size | 2 MB | 9 MB |
| Requires iOS | 17.0 | **16.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [野 匡](https://appshunter.io/developer/819954894) | [Mr.Darcy](https://appshunter.io/developer/377347580) |

## 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 |


### Multiply Fun

[App page](https://appshunter.io/ios/app/multiply-fun-19x19-lite/id6738623083)

This app makes learning multiplication tables up to 19x19 engaging through visual geometry. It uses arrays and area models to help users understand number combinations rather than just memorizing. Interactive practice and challenges build skills and confidence for learners of all ages.

**Highlights:** Geometry-powered multiplication learning, Visualize products as areas, Interactive practice with instant feedback, Activity-based challenges, Supports multiplication up to 19x19

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Frequently asked questions

### Is 知识树 free?

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

### Is Multiply Fun free?

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

### Which has better reviews, 知识树 or Multiply Fun?

Multiply Fun is rated higher. 知识树 averages 4.2 out of 5 from 5 ratings, while Multiply Fun averages 5.0 from 5 ratings.

### Do 知识树 or Multiply Fun have ads?

Multiply Fun shows ads; 知识树 does not.

### Which is updated more often, 知识树 or Multiply Fun?

知识树 ships an update every 5 days, and Multiply Fun every 4 weeks. Most recently, 知识树 was updated on October 6, 2026 and Multiply Fun on October 10, 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.*