# 上下求索 vs FEI AI

The clearest difference is in-app purchases: FEI AI at none against 上下求索's 5. FEI AI also leads on iOS requirement (13.0 vs 17.0). On price, update cadence, ads and monetization model there is nothing between them.

Both are free to download. 上下求索 sells 5 in-app purchases, starting at $3.99 per month. FEI AI asks for nothing beyond the download.

上下求索 ships an update every 2 months, FEI AI every 5 weeks. Both last shipped on November 4, 2026.

## The numbers

| Metric | 上下求索 | FEI AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/fei-ai-ai/id6742480738/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 21 MB | 15 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [亿有引力](https://appshunter.io/developer/1787379474) | [Kunchuang Technology (Shenzhen) Co., Ltd.](https://appshunter.io/developer/1630069645) |

## What reviewers say

### 上下求索

[App page](https://appshunter.io/ios/app/ai/id6741800737)

This intelligent assistant supports voice, text, and image input for Q&A and inspiration. Explore bite-sized knowledge, generate unique photos with the Time Gallery, and engage in follow-up questions for deeper understanding.

**Highlights:** Voice, text, and image input, Follow-up questions, Extended reading content, Bite-sized Knowledge module, Time Gallery photo generation, Task list and result page

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AI Creation Monthly | $3.99 | per month |
| 50 张图片加量包 | $0.99 | one-time |
| 50 Coins | $0.99 | one-time |
| 170 Coins | $3.99 | one-time |
| 420 Coins | $9.99 | one-time |


### FEI AI

[App page](https://appshunter.io/ios/app/fei-ai-ai/id6742480738)

This AI assistant helps with daily conversations, content creation, and problem-solving. It offers personalized experiences and ensures privacy through encrypted conversations.

**Highlights:** Advanced conversational AI, Content writing assistance, Creative idea generation, Personalized user experience, Secure encrypted conversations, Instant AI assistant service

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 上下求索 free?

上下求索 is free to download, with in-app purchases available.

### Is FEI AI free?

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

### Do 上下求索 or FEI AI have ads?

Neither 上下求索 nor FEI AI shows ads.

### Which is updated more often, 上下求索 or FEI AI?

上下求索 ships an update every 2 months, and FEI AI every 5 weeks. Most recently, 上下求索 was updated on November 4, 2026 and FEI AI on November 4, 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.*