# Onleihe vs Kosmos

The clearest difference is rating: Kosmos at 5.0 against Onleihe's 1.6. Onleihe's advantage is update cadence (every 2 months vs every 6 months) and ratings volume (72 vs 6). On price, review sentiment, ads and in-app purchases there is nothing between them.

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

Kosmos holds the better App Store score, 5.0 against 1.6. That said, the two scores are not equally well evidenced: Onleihe has 72 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 13% of Onleihe's written reviews are positive against 16% of Kosmos's.

Onleihe ships an update every 2 months, Kosmos every 6 months. The most recent releases landed on September 27, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Onleihe | Kosmos |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.6 (72 ratings)](https://appshunter.io/ios/app/onleihe/id422554835/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/kosmos-plus/id1064921271/reviews)** |
| Number of ratings | **72** | 6 |
| Positive reviews | 13.0% of reviews | **16.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 6 months |
| Monetization | Free | Free |
| Size | 78 MB | 3 MB |
| Requires iOS | **12.1** | 12.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [ekz.bibliotheksservice GmbH](https://appshunter.io/developer/422554838) | [Franckh-Kosmos Verlags GmbH & Co. KG](https://appshunter.io/developer/375309682) |

## What reviewers say

### Onleihe

[App page](https://appshunter.io/ios/app/onleihe/id422554835)

Access and borrow eBooks, eMagazines, eAudio, and eMusic from your local library. Browse collections, search for titles, and enjoy offline reading and listening. Titles are automatically returned after the lending period.

**Highlights:** Library selection, Category browsing, E-magazine browsing, Text search with auto-completion, Lending and download options, Reservations, Integrated eBook reader, Offline reading and playback

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Kosmos

[App page](https://appshunter.io/ios/app/kosmos-plus/id1064921271)

Enhance your reading experience with digital content like videos, audio, and images linked to specific books. Unlock exclusive multimedia materials by entering a code or answering a question from your book. Stream or download content for offline access.

**Highlights:** Access digital book content, Unlock videos, audio, and images, Use book code or answer questions, Stream or download content, Offline access, Organized media lists, Search functionality

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Onleihe free?

Onleihe is free to download, with no in-app purchases.

### Is Kosmos free?

Kosmos is free to download, with no in-app purchases.

### Which has better reviews, Onleihe or Kosmos?

Kosmos is rated higher. Onleihe averages 1.6 out of 5 from 72 ratings, while Kosmos averages 5.0 from 6 ratings.

### Do Onleihe or Kosmos have ads?

Neither Onleihe nor Kosmos shows ads.

### Which is updated more often, Onleihe or Kosmos?

Onleihe ships an update every 2 months, and Kosmos every 6 months. Most recently, Onleihe was updated on September 27, 2026 and Kosmos on September 29, 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.*