# PDF Reader Pro for Document vs EcO2 Treatment

The clearest difference is in-app purchases: EcO2 Treatment at none against PDF Reader Pro for Document's 2. EcO2 Treatment also leads on ads (none vs shown) and iOS requirement (12.0 vs 15.6). PDF Reader Pro for Document's advantage is update cadence (every 3 weeks vs every 2 months). On price and device support there is nothing between them.

Both are free to download. PDF Reader Pro for Document sells 2 in-app purchases, starting at $6.99 per month. EcO2 Treatment asks for nothing beyond the download.

PDF Reader Pro for Document ships an update every 3 weeks, EcO2 Treatment every 2 months. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | PDF Reader Pro for Document | EcO2 Treatment |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (389 ratings)](https://appshunter.io/ios/app/pdf-reader-pro-for-document/id1548604990/reviews)** | — |
| Number of ratings | **389** | — |
| Positive reviews | 86.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Ad-supported | — |
| Size | 73 MB | 41 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Fan Technology Limited](https://appshunter.io/developer/1503499100) | [PETERSON - ECO2 VIETNAM COMPANY LIMITED](https://appshunter.io/developer/1651178071) |

## What reviewers say

### PDF Reader Pro for Document

[App page](https://appshunter.io/ios/app/pdf-reader-pro-for-document/id1548604990)

This app provides a fast and secure way to view PDF documents on your mobile device. It allows you to open and read PDFs, access scanned documents, and share files in various formats like PDF and Word.

**Highlights:** View PDF documents, Access scanned PDFs, Share as PDF/Word, Reading mode, Upload documents

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF Reader Pro Monthly | $6.99 | per month |
| PDF Reader Pro Yearly | $39.99 | per year |

**What reviewers like**

- 👍 Easy to use and intuitive interface
- 💰 Completely free with no hidden costs or subscriptions
- 🚀 Fast and reliable performance
- 📄 Handles large files and catalogs well
- ✨ No bloatware or unnecessary features

**What reviewers complain about**

- 🐛 Crashes and freezes frequently
- ❌ Cannot open or read PDF files in some cases
- 🚫 Cannot delete files easily
- 📱 No landscape mode support
- 🎨 Barebones UI with limited customization

**Reported bugs**

- App crashes and freezes during use
- Cannot open downloaded PDF files
- File deletion not working properly
- Does not save last opened page
- Poor performance on small phone screens

**Requested features**

- Add landscape mode orientation
- Implement font size adjustment options
- Add page number search functionality
- Save last opened page position
- Add PDF editing capabilities


### EcO2 Treatment

[App page](https://appshunter.io/ios/app/eco2-treatment/id6443981795)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PDF Reader Pro for Document free?

PDF Reader Pro for Document is free to download, with in-app purchases available.

### Is EcO2 Treatment free?

EcO2 Treatment is free to download, with no in-app purchases.

### Do PDF Reader Pro for Document or EcO2 Treatment have ads?

PDF Reader Pro for Document shows ads; EcO2 Treatment does not.

### Which is updated more often, PDF Reader Pro for Document or EcO2 Treatment?

PDF Reader Pro for Document ships an update every 3 weeks, and EcO2 Treatment every 2 months. Most recently, PDF Reader Pro for Document was updated on November 7, 2026 and EcO2 Treatment on November 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.*