Comparison

3lines.org vs PDFReader

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

3lines.org

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
Read full description

Import ePub files that are in Simplified or Traditional Chinese and then have them converted to add a romanization line (pinyin, Sidney Lau, Yale), and a native language line (English, Spanish). The document can then be converted to PDF. It is also possible to copy Chinese text and paste it into the app. In addition, you can copy a URL from the Safari web browser, and paste in the URL to pull up the entire web page in the app and then convert it to 3 lines.

About

PDFReader

Features
Read full description

QPdfReader is an AI PDF Assistant that helps you understand documents in seconds. Upload a PDF and receive an automatic AI summary. Ask follow-up questions, translate important passages, and find the details that matter without reading every page. AI PDF Assistant • Instant AI Summary Turn long reports, contracts, articles, and study materials into a clear structured summary with key points, important details, action items, and open questions. • Chat with PDF Ask questions about a document and get context-aware answers based on its content. • Translate Documents Translate selected document content while preserving its meaning and context. • Find Key Details Faster Use AI to identify decisions, commitments, dates, tasks, and essential takeaways. Built for Reading • Open and read PDFs and supported document formats • Browse, search, and organize your files • Keep working with your documents in a focused reading experience PDF Tools When You Need Them Editing, signing, marking, exporting, and sharing tools are available from More, so the main flow stays focused on understanding your document first. For Students, Professionals, and Researchers QPdfReader is made for anyone reviewing research papers, study materials, business reports, contracts, or other important documents. Subscription QPdfReader offers optional subscriptions for expanded AI usage. Free AI usage is limited. Payment is charged to your Apple ID account at confirmation of purchase. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. You can manage subscriptions in your Apple ID account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

3lines.org4 screens
PDFReader4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
3lines.org versus PDFReader: the parameters behind the verdict, then further details
Parameter3lines.orgPDFReader
PriceFreeFree
Rating4.6 (66 ratings) — better—
Positive reviews84.8% of reviews—
Number of ratings66 — better—
Update frequencyEvery 4 days — betterEvery 2 months
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS9.0 — better18.6
Further details — not scored
Size66 MB14 MB
Age rating4+4+
DeveloperJon Hargett克 谢

In-app purchases

None

3lines.org

No in-app purchases

2 purchases

PDFReader

Subscriptions2
  • Monthly Pro$9.991 Month
  • Yearly Pro$49.991 Year

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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