# ChatPDF AI vs Hessa AI

The clearest difference is in-app purchases: Hessa AI at none against ChatPDF AI's 5. ChatPDF AI's advantage is update cadence (every 8 days vs every 3 weeks) and iOS requirement (12.0 vs 15.5). On price, ads and device support there is nothing between them.

Both are free to download. ChatPDF AI sells 5 in-app purchases, starting at $4.99 per 7 days. Hessa AI asks for nothing beyond the download.

ChatPDF AI ships an update every 8 days, Hessa AI every 3 weeks. The most recent releases landed on September 10, 2026 and June 3, 2026 respectively.

## The numbers

| Metric | ChatPDF AI | Hessa AI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 3 weeks |
| Size | 134 MB | 83 MB |
| Requires iOS | **12.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [nimet oz](https://appshunter.io/developer/1861573318) | [Muzamil Ahmed](https://appshunter.io/developer/1874816380) |

## What reviewers say

### ChatPDF AI

[App page](https://appshunter.io/ios/app/chatpdf-ai-chat-pdf-document/id6759845164)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro | $4.99 | per 7 days |
| Weekly Pro | $6.99 | per 7 days |
| Monthly Pro | $19.99 | per month |
| Yearly Pro | $44.99 | per year |
| Yearly Pro | $89.99 | per year |


### Hessa AI

[App page](https://appshunter.io/ios/app/hessa-ai/id6761432746)

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

**In-app purchases:** none


## Frequently asked questions

### Is ChatPDF AI free?

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

### Is Hessa AI free?

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

### Do ChatPDF AI or Hessa AI have ads?

Neither ChatPDF AI nor Hessa AI shows ads.

### Which is updated more often, ChatPDF AI or Hessa AI?

ChatPDF AI ships an update every 8 days, and Hessa AI every 3 weeks. Most recently, ChatPDF AI was updated on September 10, 2026 and Hessa AI on June 3, 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.*