# ISBN vs Bookshelf Diary

The clearest difference is in-app purchases: ISBN at none against Bookshelf Diary's 3. ISBN also leads on iOS requirement (14.0 vs 16.0). Bookshelf Diary's advantage is ads (none vs shown) and update cadence (every 9 days vs every 4 months). On price and device support there is nothing between them.

Both are free to download. Bookshelf Diary sells 3 in-app purchases, starting at $2.99 per month. ISBN asks for nothing beyond the download.

ISBN ships an update every 4 months, Bookshelf Diary every 9 days. The most recent releases landed on October 19, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | ISBN | Bookshelf Diary |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/bookshelf-diary/id6758018882/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 9 days** |
| Monetization | — | Free |
| Size | 16 MB | 135 MB |
| Requires iOS | **14.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [剑秋 肖](https://appshunter.io/developer/806037264) | [WANG MEI TING](https://appshunter.io/developer/1870321612) |

## What reviewers say

### ISBN

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Bookshelf Diary

[App page](https://appshunter.io/ios/app/bookshelf-diary/id6758018882)

Organize your book collection with ease using barcode scanning, batch entry for series, and progress tracking. Manage wishlists, customize shelf arrangements, and back up your data locally or via the cloud. Supports offline use and offers a dark mode.

**Highlights:** ISBN barcode scanning, Batch entry for series, Track owned and missing books, Wishlist management, Customizable shelf sorting, Excel export/import, Cloud backup, Offline functionality

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Subscription | $2.99 | per month |
| Pro 訂閱版 | $29.99 | per year |
| Plus 永久版 | $7.99 | one-time |


## Frequently asked questions

### Is ISBN free?

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

### Is Bookshelf Diary free?

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

### Do ISBN or Bookshelf Diary have ads?

ISBN shows ads; Bookshelf Diary does not.

### Which is updated more often, ISBN or Bookshelf Diary?

ISBN ships an update every 4 months, and Bookshelf Diary every 9 days. Most recently, ISBN was updated on October 19, 2026 and Bookshelf Diary on October 25, 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.*