# Summary AI vs ChatPDF AI

The clearest difference is update cadence: ChatPDF AI at every 8 days against Summary AI's every 3 weeks. ChatPDF AI also leads on iOS requirement (12.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Summary AI sells 2 in-app purchases, starting at $5.99 per month and ChatPDF AI sells 5 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Summary AI ships an update every 3 weeks, ChatPDF AI every 8 days. The most recent releases landed on October 16, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Summary AI | ChatPDF AI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 8 days** |
| Size | 43 MB | 134 MB |
| Requires iOS | 26.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Manthan Prajapati](https://appshunter.io/developer/1851010143) | [nimet oz](https://appshunter.io/developer/1861573318) |

## What reviewers say

### Summary AI

[App page](https://appshunter.io/ios/app/summary-ai-notes-and-summarize/id6759404214)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| pro monthly | $5.99 | per month |
| pro yearly | $12.99 | per year |


### 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 |


## Frequently asked questions

### Is Summary AI free?

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

### Is ChatPDF AI free?

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

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

Neither Summary AI nor ChatPDF AI shows ads.

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

Summary AI ships an update every 3 weeks, and ChatPDF AI every 8 days. Most recently, Summary AI was updated on October 16, 2026 and ChatPDF AI on October 14, 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.*