# Cat's Library vs 책인아웃

The clearest difference is in-app purchases: 책인아웃 at none against Cat's Library's 7. 책인아웃 also leads on ads (none vs shown) and rating (5.0 vs 4.8). Cat's Library's advantage is ratings volume (44 vs 4) and update cadence (every 4 days vs weekly). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Cat's Library sells 7 in-app purchases, starting at $4.99 per month. 책인아웃 asks for nothing beyond the download.

책인아웃 holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Cat's Library has 44 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 87% of Cat's Library's written reviews are positive against 96% of 책인아웃's.

Cat's Library ships an update every 4 days, 책인아웃 weekly. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Cat's Library | 책인아웃 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (44 ratings)](https://appshunter.io/ios/app/cats-library-book-tracker/id6752113848/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/id6797207682/reviews)** |
| Number of ratings | **44** | 4 |
| Positive reviews | 86.6% of reviews | **95.8% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Weekly |
| Monetization | Free with in-app purchases | **Free** |
| Size | 237 MB | 470 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Lo-Fi Labs Inc.](https://appshunter.io/developer/6796905768) | [Hail Moon](https://appshunter.io/developer/6797207684) |

## What reviewers say

### Cat's Library

[App page](https://appshunter.io/ios/app/cats-library-book-tracker/id6752113848)

Enhance your reading journey with a charming companion. Track your progress, organize your library, and collect favorite quotes. Customize your reading space and share your literary adventures with friends.

**Highlights:** Reading timer with cat companion, Organize books by status, Barcode book registration, Quote collection with OCR, Social bookshelf sharing, Customizable cat outfits and room themes, Reading recap and statistics

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Book Butler Monthly Sub | $4.99 | per month |
| Pro Book Butler Annual Subscription | $29.99 | per year |
| Pro Book Butler Annual Subscription | $29.99 | per year |
| Coin Pack - 100 | $1.49 | one-time |
| Coin Pack - 500 | $6.49 | one-time |
| Coin Pack - 1000 | $9.99 | one-time |
| Pro Book Butler Lifetime Subs | $79.99 | one-time |


### 책인아웃

[App page](https://appshunter.io/ios/app/id6797207682)

This app lets you organize your reading, track your progress, and connect with other book lovers. Create a virtual bookshelf, earn photo cards for finished books, and set reading goals. Discover new books with personalized recommendations and join discussions in the community.

**Highlights:** Virtual bookshelf organization, Reading progress tracking, Book completion photo cards, Reading goals and challenges, Book community discussions, Personalized book recommendations, Import reading records via CSV

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

**In-app purchases:** none


## Frequently asked questions

### Is Cat's Library free?

Cat's Library is free to download, with in-app purchases available.

### Is 책인아웃 free?

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

### Which has better reviews, Cat's Library or 책인아웃?

책인아웃 is rated higher. Cat's Library averages 4.8 out of 5 from 44 ratings, while 책인아웃 averages 5.0 from 4 ratings.

### Do Cat's Library or 책인아웃 have ads?

Cat's Library shows ads; 책인아웃 does not.

### Which is updated more often, Cat's Library or 책인아웃?

Cat's Library ships an update every 4 days, and 책인아웃 weekly. Most recently, Cat's Library was updated on October 30, 2026 and 책인아웃 on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*