# 知识树 vs Least Common Multiple Solver

The clearest difference is iOS requirement: Least Common Multiple Solver at 15.0 against 知识树's 17.0. On price, update cadence, ads and in-app purchases 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 Least Common Multiple Solver sells 7 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

知识树 ships an update every 5 days, Least Common Multiple Solver weekly. The most recent releases landed on September 28, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | 知识树 | Least Common Multiple Solver |
| --- | --- | --- |
| 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 | No |
| Update frequency | **Every 5 days** | Weekly |
| Monetization | Freemium | — |
| Size | 2 MB | 179 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [野 匡](https://appshunter.io/developer/819954894) | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) |

## 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 |


### Least Common Multiple Solver

[App page](https://appshunter.io/ios/app/least-common-multiple-solver/id6792020111)

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| +30 User Tokens | $0.29 | one-time |
| +1 Convenience Token / 6h, max. +2 | $0.59 | one-time |
| +150 User Tokens | $0.99 | one-time |
| +2 Convenience Tokens / 6h, max. +4 | $0.99 | one-time |
| +300 User Tokens | $1.49 | one-time |
| +4 Convenience Tokens / 6h, max. +8 | $1.59 | one-time |
| Lifetime Access | $1.99 | one-time |


## Frequently asked questions

### Is 知识树 free?

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

### Is Least Common Multiple Solver free?

Least Common Multiple Solver is free to download, with in-app purchases available.

### Do 知识树 or Least Common Multiple Solver have ads?

Neither 知识树 nor Least Common Multiple Solver shows ads.

### Which is updated more often, 知识树 or Least Common Multiple Solver?

知识树 ships an update every 5 days, and Least Common Multiple Solver weekly. Most recently, 知识树 was updated on September 28, 2026 and Least Common Multiple Solver on September 23, 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.*