# udn 讀書館 vs iCosmos寂天雲

The clearest difference is review sentiment: udn 讀書館 at 50% against iCosmos寂天雲's 6%. udn 讀書館 also leads on rating (2.5 vs 1.0) and ratings volume (8 vs 1). iCosmos寂天雲's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

udn 讀書館 holds the better App Store score, 2.5 against 1.0. That said, the two scores are not equally well evidenced: udn 讀書館 has 8 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of udn 讀書館's written reviews are positive against 6% of iCosmos寂天雲's.

udn 讀書館 ships an update every 6 weeks, iCosmos寂天雲 every 2 months. The most recent releases landed on October 15, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | udn 讀書館 | iCosmos寂天雲 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.5 (8 ratings)](https://appshunter.io/ios/app/udn/id1342153816/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/icosmos/id1544203592/reviews) |
| Number of ratings | **8** | 1 |
| Positive reviews | **50.0% of reviews** | 6.4% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Ad-supported | **Free** |
| Size | 63 MB | 41 MB |
| Requires iOS | 16.0 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [udn.com](https://appshunter.io/developer/370132216) | [Soyong Corporation](https://appshunter.io/developer/339142397) |

## What reviewers say

### udn 讀書館

[App page](https://appshunter.io/ios/app/udn/id1342153816)

Access e-books, magazines, and newspapers from multiple libraries in one app. Enjoy a seamless reading experience with offline capabilities and customizable settings. Borrow and reserve digital content for free.

**Highlights:** Integrates multiple library lending services, Free mobile borrowing of e-books, magazines, newspapers, Offline reading of downloaded content, Supports PDF and EPUB formats, Customizable reading settings (brightness, text size, night mode), Borrow and reserve books with automatic returns

**Features:** Vision Pro support

**In-app purchases:** none


### iCosmos寂天雲

[App page](https://appshunter.io/ios/app/icosmos/id1544203592)

This app enhances language learning by integrating with specific textbooks. It offers audiobook playback with customizable speeds and repeat functions, as well as interactive MeBook features like synchronized text and audio, pronunciation practice, and vocabulary management tools.

**Highlights:** Audiobook playback with QR code scanning, Synchronized text and audio (MeBook), Customizable playback speed and repetition, Pronunciation practice with microphone input, Vocabulary management and spaced repetition, Reading comprehension exercises, Chapter-based quizzes

**In-app purchases:** none


## Frequently asked questions

### Is udn 讀書館 free?

udn 讀書館 is free to download, with no in-app purchases.

### Is iCosmos寂天雲 free?

iCosmos寂天雲 is free to download, with no in-app purchases.

### Which has better reviews, udn 讀書館 or iCosmos寂天雲?

udn 讀書館 is rated higher. udn 讀書館 averages 2.5 out of 5 from 8 ratings, while iCosmos寂天雲 averages 1.0 from 1 ratings.

### Do udn 讀書館 or iCosmos寂天雲 have ads?

udn 讀書館 shows ads; iCosmos寂天雲 does not.

### Which is updated more often, udn 讀書館 or iCosmos寂天雲?

udn 讀書館 ships an update every 6 weeks, and iCosmos寂天雲 every 2 months. Most recently, udn 讀書館 was updated on October 15, 2026 and iCosmos寂天雲 on October 24, 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.*