# 思维模型手册（Mental Models Handbook） vs NUMEN

The clearest difference is price: NUMEN at Free against 思维模型手册（Mental Models Handbook）'s $5.99. NUMEN also leads on update cadence (every 5 weeks vs every 14 months). 思维模型手册（Mental Models Handbook）'s advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

NUMEN is free to download; 思维模型手册（Mental Models Handbook） costs $5.99 up front. NUMEN sells 1 one-off in-app purchase. 思维模型手册（Mental Models Handbook） asks for nothing beyond the download.

思维模型手册（Mental Models Handbook） ships an update every 14 months, NUMEN every 5 weeks. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 思维模型手册（Mental Models Handbook） | NUMEN |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 5 weeks** |
| Size | 21 MB | 3 MB |
| Requires iOS | 16.6 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [tengfei qin](https://appshunter.io/developer/1093067878) | [Byoungho Kim](https://appshunter.io/developer/1888452963) |

## What reviewers say

### 思维模型手册（Mental Models Handbook）

[App page](https://appshunter.io/ios/app/mental-models-handbook/id6747288733)

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

**In-app purchases:** none


### NUMEN

[App page](https://appshunter.io/ios/app/numen-feel-math-again/id6767151538)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NUMEN — Unlock All | $2.99 | one-time |


## Frequently asked questions

### Is 思维模型手册（Mental Models Handbook） free?

思维模型手册（Mental Models Handbook） costs $5.99, with no in-app purchases.

### Is NUMEN free?

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

### Do 思维模型手册（Mental Models Handbook） or NUMEN have ads?

Neither 思维模型手册（Mental Models Handbook） nor NUMEN shows ads.

### Which is updated more often, 思维模型手册（Mental Models Handbook） or NUMEN?

思维模型手册（Mental Models Handbook） ships an update every 14 months, and NUMEN every 5 weeks. Most recently, 思维模型手册（Mental Models Handbook） was updated on October 28, 2026 and NUMEN on October 25, 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.*