# 什么？ vs 知己

The clearest difference is ads: 知己 at none against 什么？'s shown. 知己 also leads on update cadence (every 3 days vs fortnightly). 什么？'s advantage is iOS requirement (17.0 vs 26.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

什么？ ships an update fortnightly, 知己 every 3 days. Both last shipped on October 19, 2026.

## The numbers

| Metric | 什么？ | 知己 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ai/id6751869037/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 3 days** |
| Monetization | Ad-supported | — |
| Size | 8 MB | 8 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone | iPhone |
| Age rating | 12+ | 12+ |
| Developer | [唯识无境科技(深圳)有限责任公司/Weishi Wujing Technology (shenzhen) Co., Ltd](https://appshunter.io/developer/1837331622) | [伟烈 熊](https://appshunter.io/developer/6792607821) |

## What reviewers say

### 什么？

[App page](https://appshunter.io/ios/app/ai/id6751869037)

This app offers a minimalist card-based interface for exploring knowledge. It uses AI to generate personalized content based on your interactions, allowing for seamless follow-up questions and a unique learning journey.

**Highlights:** Minimalist card interface, Personalized AI content generation, Swipe to switch topics, Highlight text for AI follow-up questions, Frictionless exploration

**In-app purchases:** none


### 知己

[App page](https://appshunter.io/ios/app/ai/id6816163811)

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

**In-app purchases:** none


## Frequently asked questions

### Is 什么？ free?

什么？ is free to download, with no in-app purchases.

### Is 知己 free?

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

### Do 什么？ or 知己 have ads?

什么？ shows ads; 知己 does not.

### Which is updated more often, 什么？ or 知己?

什么？ ships an update fortnightly, and 知己 every 3 days. Most recently, 什么？ was updated on October 19, 2026 and 知己 on October 19, 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.*