3lines.org vs Serafim Audio
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
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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.
Serafim Audio
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Serafim Audio is an exclusive app for Serafim A-series headphones. If you have any quetions, please leave a comment or email to us. sales@serafim-tech.com
Screenshots
Verdict
The clearest difference is update cadence: 3lines.org at every 4 days against Serafim Audio's every 3 months. 3lines.org also leads on iOS requirement (9.0 vs 13.0). On price, ads, in-app purchases and device support 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.
3lines.org ships an update every 4 days, Serafim Audio every 3 months. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.
| Parameter | 3lines.org | Serafim Audio |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (66 ratings) — better | — |
| Positive reviews | 84.8% of reviews | — |
| Number of ratings | 66 — better | — |
| Update frequency | Every 4 days — better | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 9.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 66 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Jon Hargett | Serafim Technologies Inc. |
In-app purchases
3lines.org
No in-app purchases
Serafim Audio
No in-app purchases
