# ChatPDF vs Trellis

The clearest difference is ads: Trellis at none against ChatPDF's shown. ChatPDF's advantage is iOS requirement (15.6 vs 17.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. ChatPDF sells 2 in-app purchases, starting at $14.99 per month and Trellis sells 6 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ChatPDF ships an update every 4 days, Trellis every 5 days. The most recent releases landed on October 16, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | ChatPDF | Trellis |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (92 ratings)](https://appshunter.io/ios/app/chatpdf-chat-pdf-ai/id6742454061/reviews)** | — |
| Number of ratings | **92** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Every 5 days |
| Monetization | Free with in-app purchases | — |
| Size | 41 MB | 31 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [ChatPDF GmbH](https://appshunter.io/developer/1711436087) | [Yusuf Melih Bozgeyik](https://appshunter.io/developer/6794795348) |

## What reviewers say

### ChatPDF

[App page](https://appshunter.io/ios/app/chatpdf-chat-pdf-ai/id6742454061)

This AI-powered tool allows you to ask questions and get summaries directly from your PDF documents. It supports multiple files, OCR, and multilingual interactions, making complex information easily accessible.

**Highlights:** Instant answers from PDFs, Quick document summaries, Chat with multiple PDFs, OCR for scanned documents, Multilingual support, Cross-device access

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plus Subscription | $14.99 | per month |
| ChatPDF Yearly Plus Plan | $89.99 | per year |


### Trellis

[App page](https://appshunter.io/ios/app/trellis-study-planner/id6799188483)

**Features:** Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Trellis Base | $4.99 | per month |
| Trellis Max | $9.99 | per month |
| Trellis Ultra | $19.99 | per month |
| 50 Credit | $3.99 | one-time |
| 150 Credit | $8.99 | one-time |
| 400 Credit | $17.99 | one-time |


## Frequently asked questions

### Is ChatPDF free?

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

### Is Trellis free?

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

### Do ChatPDF or Trellis have ads?

ChatPDF shows ads; Trellis does not.

### Which is updated more often, ChatPDF or Trellis?

ChatPDF ships an update every 4 days, and Trellis every 5 days. Most recently, ChatPDF was updated on October 16, 2026 and Trellis on October 13, 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.*