# PDF Book Reader vs ReadFlow

The clearest difference is rating: ReadFlow at 4.8 against PDF Book Reader's 3.9. ReadFlow also leads on review sentiment (100% vs 61%) and ads (none vs shown). PDF Book Reader's advantage is ratings volume (31 vs 5) and iOS requirement (13.0 vs 16.0). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. PDF Book Reader sells 2 in-app purchases, starting at $3.99 per month and ReadFlow sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

ReadFlow holds the better App Store score, 4.8 against 3.9. That said, the two scores are not equally well evidenced: PDF Book Reader has 31 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 61% of PDF Book Reader's written reviews are positive against 100% of ReadFlow's.

PDF Book Reader ships an update every 5 days, ReadFlow every 4 days. The most recent releases landed on September 13, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | PDF Book Reader | ReadFlow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (31 ratings)](https://appshunter.io/ios/app/pdf-book-reader/id1576631236/reviews) | **[4.8 (5 ratings)](https://appshunter.io/ios/app/readflow/id6447425350/reviews)** |
| Number of ratings | **31** | 5 |
| Positive reviews | 61.1% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 days | **Every 4 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 46 MB | 3 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [B TO J PTY LTD](https://appshunter.io/developer/569308231) | [实 许](https://appshunter.io/developer/681075194) |

## What reviewers say

### PDF Book Reader

[App page](https://appshunter.io/ios/app/pdf-book-reader/id1576631236)

Easily read, manage, and annotate PDF books and documents. This app offers a smooth reading experience, powerful annotation tools, and seamless cloud integration. Organize, search, and share your PDFs with ease.

**Highlights:** Natural PDF reading and navigation, PDF bookmarking and annotation, Text search and OCR extraction, PDF merging and page rearrangement, Cloud storage integration (Google Drive, Dropbox, iCloud), File import and export via cloud and Files app, PDF sharing and printing

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Subscription | $3.99 | per month |
| 1 Year Subscription | $28.99 | per year |


### ReadFlow

[App page](https://appshunter.io/ios/app/readflow/id6447425350)

This app transforms PDF documents into a comfortable reading experience on small screens. It offers text reflow, customization options for fonts and themes, and iCloud sync for seamless access across devices. Enjoy reading PDFs as easily as other ebook formats.

**Highlights:** PDF text reflow for mobile, Customizable fonts and themes, Import custom font files, iCloud sync, PDF file cropping, Metadata editing, Generate and share reflowed text

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ReadFlow Pro 1x | $0.99 | per month |
| ReadFlow Pro 12x | $9.99 | per year |
| ReadFlow Pro ∞ | $19.99 | one-time |


## Frequently asked questions

### Is PDF Book Reader free?

PDF Book Reader is free to download, with in-app purchases available.

### Is ReadFlow free?

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

### Which has better reviews, PDF Book Reader or ReadFlow?

ReadFlow is rated higher. PDF Book Reader averages 3.9 out of 5 from 31 ratings, while ReadFlow averages 4.8 from 5 ratings.

### Do PDF Book Reader or ReadFlow have ads?

PDF Book Reader shows ads; ReadFlow does not.

### Which is updated more often, PDF Book Reader or ReadFlow?

PDF Book Reader ships an update every 5 days, and ReadFlow every 4 days. Most recently, PDF Book Reader was updated on September 13, 2026 and ReadFlow on September 19, 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.*