# 3lines.org vs PDFReader

The clearest difference is in-app purchases: 3lines.org at none against PDFReader's 2. 3lines.org also leads on ads (none vs shown) and update cadence (every 4 days vs every 2 months). On price there is nothing between them.

Both are free to download. PDFReader sells 2 in-app purchases, starting at $9.99 per month. 3lines.org asks for nothing beyond the download.

3lines.org ships an update every 4 days, PDFReader every 2 months. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 3lines.org | PDFReader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (66 ratings)](https://appshunter.io/ios/app/3linesorg/id1352194221/reviews)** | — |
| Number of ratings | **66** | — |
| Positive reviews | 84.8% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 days** | Every 2 months |
| Monetization | Free | — |
| Size | 66 MB | 14 MB |
| Requires iOS | **9.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Jon Hargett](https://appshunter.io/developer/1087189196) | [克 谢](https://appshunter.io/developer/1722475771) |

## What reviewers say

### 3lines.org

[App page](https://appshunter.io/ios/app/3linesorg/id1352194221)

Convert Chinese ePub files and web pages into a three-line format, adding romanization and translation. The converted documents can be saved as PDFs or copied for further use.

**Highlights:** ePub to three-line conversion, Add romanization (pinyin, Sidney Lau, Yale), Add native language translation (English, Spanish), Convert to PDF, Paste Chinese text, Import from URL

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

**In-app purchases:** none


### PDFReader

[App page](https://appshunter.io/ios/app/pdfreader-ai-pdf-assistant/id6758230344)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Pro | $9.99 | per month |
| Yearly Pro | $49.99 | per year |


## Frequently asked questions

### Is 3lines.org free?

3lines.org is free to download, with no in-app purchases.

### Is PDFReader free?

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

### Do 3lines.org or PDFReader have ads?

PDFReader shows ads; 3lines.org does not.

### Which is updated more often, 3lines.org or PDFReader?

3lines.org ships an update every 4 days, and PDFReader every 2 months. Most recently, 3lines.org was updated on November 2, 2026 and PDFReader on October 31, 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.*