# Cat's Library vs Modam

The clearest difference is in-app purchases: Modam at none against Cat's Library's 7. Modam also leads on ads (none vs shown). On price, update cadence, 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. Modam asks for nothing beyond the download.

Cat's Library ships an update every 4 days, Modam weekly. The most recent releases landed on October 20, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Cat's Library | Modam |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (43 ratings)](https://appshunter.io/ios/app/cats-library-book-tracker/id6752113848/reviews)** | — |
| Number of ratings | **43** | — |
| Positive reviews | 88.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Weekly |
| Monetization | Free with in-app purchases | — |
| Size | 229 MB | 39 MB |
| Requires iOS | 16.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Lo-Fi Labs Inc.](https://appshunter.io/developer/6796905768) | [sangjoon son](https://appshunter.io/developer/1834973157) |

## 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 |


### Modam

[App page](https://appshunter.io/ios/app/modam/id6757088246)

**Features:** macOS Compatibility, Vision Pro 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 Modam free?

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

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

Cat's Library shows ads; Modam does not.

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

Cat's Library ships an update every 4 days, and Modam weekly. Most recently, Cat's Library was updated on October 20, 2026 and Modam on October 11, 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.*