# 3lines.org vs Kuadra

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.

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 24, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | 3lines.org | Kuadra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (66 ratings)](https://appshunter.io/ios/app/3linesorg/id1352194221/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/kuadra/id1575441484/reviews) |
| Number of ratings | **66** | 1 |
| Positive reviews | 84.8% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Weekly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 66 MB | 4 MB |
| Requires iOS | **9.0** | 14.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jon Hargett](https://appshunter.io/developer/1087189196) | [Luca Picariello](https://appshunter.io/developer/1562569427) |

## 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


### Kuadra

[App page](https://appshunter.io/ios/app/kuadra/id1575441484)

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.

**Highlights:** Record 2D and 3D measurements, Add notes and photos, Dictate or write measurements, Save project annotations, Export measurements as PDF, Include photo location

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kuadra full license | $3.99 | one-time |


## Frequently asked questions

### Is 3lines.org free?

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

### Is Kuadra free?

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

### Which has better reviews, 3lines.org or Kuadra?

3lines.org is rated higher. 3lines.org averages 4.6 out of 5 from 66 ratings, while Kuadra averages 3.0 from 1 ratings.

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

Neither 3lines.org nor Kuadra shows ads.

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

3lines.org ships an update every 4 days, and Kuadra weekly. Most recently, 3lines.org was updated on October 24, 2026 and Kuadra on October 13, 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.*