# PDF Reader vs Part 66+

The clearest difference is update cadence: Part 66+ at fortnightly against PDF Reader's every 2 months. PDF Reader's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 26.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

PDF Reader ships an update every 2 months, Part 66+ fortnightly. The most recent releases landed on October 14, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | PDF Reader | Part 66+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (3.9K ratings)](https://appshunter.io/ios/app/pdf-reader-pdfelement/id1150215996/reviews)** | — |
| Number of ratings | **3.9K** | — |
| Positive reviews | 76.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 173 MB | 10 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Wondershare Technology (Hunan) Co.,Ltd.](https://appshunter.io/developer/1721309409) | [Airworthiness Limited](https://appshunter.io/developer/1896336257) |

## What reviewers say

### PDF Reader

[App page](https://appshunter.io/ios/app/pdf-reader-pdfelement/id1150215996)

This app offers a superior PDF reading experience with its innovative Liquid Mode, which optimizes documents for mobile screens. It also provides robust tools for annotating, signing, managing, and sharing your PDF files, catering to both work and study needs.

**Highlights:** Liquid Mode for optimized mobile reading, Annotation tools (pencil, text, highlighting), Handwritten signature insertion, File management (move, merge, copy, delete), Cloud service integration (Wondershare, iCloud), Create blank PDFs and folders

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 🚀 Efficient PDF editing
- 💡 Useful annotation tools
- 🚀 Convenient for students/professionals
- 👍 Great value for free app

**What reviewers complain about**

- 🐛 Crashes and glitches
- 🔒 Privacy concerns with account requirement
- 👎 Unintuitive user interface
- 🐛 Unreliable saving/syncing
- 👎 Limited functionality compared to paid version

**Reported bugs**

- Text boxes appearing randomly
- Inability to select/edit text in some PDFs
- Scrolling issues and page loading delays
- Incompatibility with certain PDF formats

**Requested features**

- Ability to edit text formatting (font, size, color)
- Support for multiple open documents
- Improved Apple Pencil integration
- Bookmark/favorite feature for frequently used PDFs
- Expanded cloud storage integration (OneDrive, Google Drive, etc.)


### Part 66+

[App page](https://appshunter.io/ios/app/part-66-plus/id6799710774)

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

**In-app purchases:** none


## Frequently asked questions

### Is PDF Reader free?

PDF Reader is free to download, with no in-app purchases.

### Is Part 66+ free?

Part 66+ is free to download, with no in-app purchases.

### Do PDF Reader or Part 66+ have ads?

Neither PDF Reader nor Part 66+ shows ads.

### Which is updated more often, PDF Reader or Part 66+?

PDF Reader ships an update every 2 months, and Part 66+ fortnightly. Most recently, PDF Reader was updated on October 14, 2026 and Part 66+ on September 30, 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.*