3lines.org vs Kuadra
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.
Kuadra
This app helps you record and save measurements for various projects. You can dictate or write down dimensions, add notes and photos, and export everything as a PDF. It's designed for professionals who need to keep track of project details.
- Record 2D and 3D measurements
- Add notes and photos
- Dictate or write measurements
- Save project annotations
- Export measurements as PDF
- Include photo location
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If you have to take measures Kuadra is the App for you, in a few simple steps you will always have an assistant with you who will keep annotations of all your works. You can save free, two-dimensional and three-dimensional measurements and, if necessary, even simple notes. Just create a new work and record your measurements both by dictating them and writing them, with a related photo or not. Once finished you can share a PDF with all the measurements and also the location where you took the photo. Quadra is developed for graphic designers, printers, interior designers, glassmakers, furniture makers, tilers, architects, surveyors, painters, window and door designers, upholsterers and anyone else who wants or needs to take measurements. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is rating: 3lines.org at 4.6 against Kuadra's 3.0. 3lines.org also leads on in-app purchases (none vs 1) and ratings volume (66 vs 1). Kuadra's advantage is review sentiment (100% vs 85%). On price, update cadence, ads 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. Kuadra sells 1 one-off in-app purchase. 3lines.org asks for nothing beyond the download.
3lines.org holds the better App Store score, 4.6 against 3.0. That said, the two scores are not equally well evidenced: 3lines.org has 66 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 85% of 3lines.org's written reviews are positive against 100% of Kuadra's, so the app with the better star average is not the one people write more warmly about.
3lines.org ships an update every 4 days, Kuadra weekly. The most recent releases landed on October 15, 2026 and October 13, 2026 respectively.
| Parameter | 3lines.org | Kuadra |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (66 ratings) — better | 3.0 (1 ratings) |
| Positive reviews | 84.8% of reviews | 100.0% of reviews — better |
| Number of ratings | 66 — better | 1 |
| Update frequency | Every 4 days — better | Weekly |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 14.1 |
| Further details — not scored | ||
| Size | 66 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Jon Hargett | Luca Picariello |
Customer experience
3lines.org
Kuadra
In-app purchases
3lines.org
No in-app purchases
Kuadra
- Kuadra full license$3.99
