# Cat's Library vs Flyleaf

The clearest difference is in-app purchases: Flyleaf at none against Cat's Library's 7. Flyleaf also leads on ads (none vs shown). Cat's Library's advantage is update cadence (every 4 days vs every 3 weeks) and iOS requirement (16.6 vs 26.5). On price and device support there is nothing between them.

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

Cat's Library ships an update every 4 days, Flyleaf every 3 weeks. The most recent releases landed on October 16, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Cat's Library | Flyleaf |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (42 ratings)](https://appshunter.io/ios/app/cats-library-book-tracker/id6752113848/reviews)** | — |
| Number of ratings | **42** | — |
| Positive reviews | 86.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 222 MB | 30 MB |
| Requires iOS | **16.6** | 26.5 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Lo-Fi Labs Inc.](https://appshunter.io/developer/6796905768) | [Seongil Yeo](https://appshunter.io/developer/1727822236) |

## What reviewers say

### Cat's Library

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

Enhance your reading with adorable cats! Track your progress, organize your personal library, and collect favorite quotes. This app offers a unique, motivating, and healing reading experience.

**Highlights:** Read with cats and a reading timer, Organize books into To Read, Currently Reading, Read, Convenient book registration (search, manual, barcode), Collect and save favorite quotes with OCR, Track reading progress and history, Monthly reading activity calendar

**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 |


### Flyleaf

[App page](https://appshunter.io/ios/app/flyleaf/id6759834893)

**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 Flyleaf free?

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

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

Cat's Library shows ads; Flyleaf does not.

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

Cat's Library ships an update every 4 days, and Flyleaf every 3 weeks. Most recently, Cat's Library was updated on October 16, 2026 and Flyleaf on September 30, 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.*