# ISBN vs Ritsu

The clearest difference is in-app purchases: ISBN at none against Ritsu's 3. Ritsu's advantage is ads (none vs shown) and update cadence (fortnightly vs every 4 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Ritsu sells 3 in-app purchases, starting at $3.99 per month. ISBN asks for nothing beyond the download.

ISBN ships an update every 4 months, Ritsu fortnightly. The most recent releases landed on October 19, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | ISBN | Ritsu |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ritsu-book-tracker/id6767137078/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | — | Free with in-app purchases |
| Size | 16 MB | 57 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [剑秋 肖](https://appshunter.io/developer/806037264) | [KYOSUKE WATANABE](https://appshunter.io/developer/1833049963) |

## What reviewers say

### ISBN

[App page](https://appshunter.io/ios/app/isbn/id6449743934)

**Features:** macOS Compatibility

**In-app purchases:** none


### Ritsu

[App page](https://appshunter.io/ios/app/ritsu-book-tracker/id6767137078)

Organize your reading with a visually appealing digital bookshelf. Track books you've read, are currently reading, or want to read, and save notes and impressions for each title. Enjoy a beautiful way to manage your reading history and TBR list.

**Highlights:** Visual bookshelf UI, Track read, reading, and TBR books, Save notes and quotes, Manage reading status, Organize various book types, Beautiful reading history view

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ritsu Pro Monthly | $3.99 | per month |
| Ritsu Pro Yearly | $19.99 | per year |
| Ritsu Pro Lifetime | $34.99 | one-time |


## Frequently asked questions

### Is ISBN free?

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

### Is Ritsu free?

Ritsu is free to download, with in-app purchases available.

### Do ISBN or Ritsu have ads?

ISBN shows ads; Ritsu does not.

### Which is updated more often, ISBN or Ritsu?

ISBN ships an update every 4 months, and Ritsu fortnightly. Most recently, ISBN was updated on October 19, 2026 and Ritsu on October 10, 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.*