# 知识树 vs Multiply Fun

The clearest difference is ads: 知识树 at none against Multiply Fun's shown. Multiply Fun's advantage is iOS requirement (15.6 vs 17.0). On price, update cadence, in-app purchases and device support 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.

知识树 ships an update every 5 days, Multiply Fun weekly. The most recent releases landed on September 23, 2026 and September 15, 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)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 38.9% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 5 days** | Weekly |
| Monetization | Freemium | — |
| Size | 2 MB | 9 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| 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-9x9-lite/id6738277751)

**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.

### 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 weekly. Most recently, 知识树 was updated on September 23, 2026 and Multiply Fun on September 15, 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.*