3lines.org vs Library Merger
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
Read full descriptionHide 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.
Library Merger
Easily combine two JW Library backups into a single, unified version. Resolve conflicts by choosing which content to keep, ensuring your study materials are consistent across all your devices. This utility streamlines library management for users of JW Library.
- Combine two JW Library backups
- Resolve content conflicts
- Restore merged backup to devices
- Open backups via AirDrop
- Open-source code
Read full descriptionHide full description
You know the problem: You study with JW Library® on different devices - and in the end, you have two versions, that you can’t easily combine anymore. With the Library Merger this is a thing of the past! The Library Merger allows you to quickly and easily combine two JW Library® backups into one. Simply open both backups in the app (you can even send them via AirDrop). The app will merge them into one. If it finds a conflict (like two bookmarks at the same place, or two markings that overlap), you can choose which version to keep. In the end, you have one merged backup which you can easily restore on your devices. The process - if done regularly - literally takes you seconds! Library Merger is still in its early stages and is being actively developed. The code is open source and can be found on GitHub. If you found a bug or have suggestions, feel free to contact me.
Screenshots
Verdict
The clearest difference is update cadence: 3lines.org at every 4 days against Library Merger's every 2 months. 3lines.org also leads on iOS requirement (9.0 vs 14.0). On price, rating, review sentiment and ratings volume 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.6 for 3lines.org against 4.6 for Library Merger. Both are backed by a comparable volume of ratings — 66 and 38 respectively. Written reviews are what separate them: 85% of 3lines.org's written reviews are positive against 81% of Library Merger's.
3lines.org ships an update every 4 days, Library Merger every 2 months. The most recent releases landed on September 22, 2026 and July 17, 2026 respectively.
| Parameter | 3lines.org | Library Merger |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (66 ratings) | 4.6 (38 ratings) |
| Positive reviews | 84.8% of reviews — better | 81.4% of reviews |
| Number of ratings | 66 — better | 38 |
| Update frequency | Every 4 days — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 66 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Jon Hargett | Andreas Skorczyk |
Customer experience
3lines.org
Library Merger
In-app purchases
3lines.org
No in-app purchases
Library Merger
No in-app purchases
Questions
Is 3lines.org free?
Is Library Merger free?
Which has better reviews, 3lines.org or Library Merger?
Do 3lines.org or Library Merger have ads?
Which is updated more often, 3lines.org or Library Merger?
Other comparisons
