# PDF转换器 vs Chat AI

The clearest difference is ads: PDF转换器 at none against Chat AI's shown. PDF转换器 also leads on iOS requirement (11.0 vs 15.6). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. PDF转换器 sells 3 in-app purchases, starting at $3.99 per 7 days and Chat AI sells 3 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on September 10, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | PDF转换器 | Chat AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.6 (8 ratings)](https://appshunter.io/ios/app/chat-ai-chatbot-and-assistant/id1672248522/reviews)** |
| Number of ratings | — | **8** |
| Positive reviews | — | 97.1% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 34 MB | 54 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [鑫鑫 陈](https://appshunter.io/developer/1647351343) | [ParticleThink Technology Co., Ltd.](https://appshunter.io/developer/1630886372) |

## What reviewers say

### PDF转换器

[App page](https://appshunter.io/ios/app/pdf/id1659370888)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| pdf转换器周订阅 | $3.99 | per 7 days |
| pdf转换器月订阅 | $12.99 | per month |
| pdf转换器季度订阅 | $19.99 | per 3 months |


### Chat AI

[App page](https://appshunter.io/ios/app/chat-ai-chatbot-and-assistant/id1672248522)

This AI-powered application assists with a wide range of tasks, from answering complex questions and writing essays to acting as a personal secretary or coding assistant. It leverages the 3.5-turbo model to provide human-like responses and offers pre-prepared prompts for various topics.

**Highlights:** AI-powered assistance, Essay writing, Coding help, Personal secretary functions, Knowledge encyclopedia, Email drafting, Travel advice

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AI Premium | $3.99 | per 7 days |
| AI Premium | $9.99 | per month |
| AI Premium | $29.99 | per year |


## Frequently asked questions

### Is PDF转换器 free?

PDF转换器 is free to download, with in-app purchases available.

### Is Chat AI free?

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

### Do PDF转换器 or Chat AI have ads?

Chat AI shows ads; PDF转换器 does not.

### Which is updated more often, PDF转换器 or Chat AI?

PDF转换器 ships an update every 2 weeks, and Chat AI every 2 weeks. Most recently, PDF转换器 was updated on September 10, 2026 and Chat AI on September 17, 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.*