# ISBN vs Aspose.PDF

The clearest difference is price: Aspose.PDF at Free against ISBN's $0.99. Aspose.PDF also leads on update cadence (every 4 weeks vs every 8 months) and review sentiment (80% vs 67%). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Aspose.PDF is free to download; ISBN costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ISBN ships an update every 8 months, Aspose.PDF every 4 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | ISBN | Aspose.PDF |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[3.9 (15 ratings)](https://appshunter.io/ios/app/asposepdf-converter-viewer/id1580359566/reviews)** |
| Number of ratings | — | **15** |
| Positive reviews | 66.7% of reviews | **80.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 4 weeks** |
| Monetization | Paid | **Free** |
| Size | 3 MB | 42 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [CROMBEZ Emmanuel](https://appshunter.io/developer/375656695) | [Aspose Pty Ltd](https://appshunter.io/developer/746299884) |

## What reviewers say

### ISBN

[App page](https://appshunter.io/ios/app/isbn/id1061626540)

Create and manage a personal book inventory using ISBN codes. Organize books with custom flags, notes, and contact associations. Export your library data to CSV for use in spreadsheets.

**Highlights:** Book inventory management, ISBN scanning/entry, Customizable flags for categorization, Free text notes per book, Attach books to contacts, CSV export for spreadsheets

**In-app purchases:** none


### Aspose.PDF

[App page](https://appshunter.io/ios/app/asposepdf-converter-viewer/id1580359566)

This application provides a comprehensive suite of tools for managing PDF files, including conversion, editing, optimization, and security features. It allows users to compress, merge, split, rotate, and protect PDFs, as well as convert them to and from various formats like Word, Excel, and images. The app also offers OCR capabilities and a PDF viewer.

**Highlights:** Compress PDF files, Merge and split PDFs, Convert PDF to Word, Excel, PPT, and images, Protect PDFs with passwords, Add watermarks and signatures, Scan documents to PDF, OCR for searchable PDFs

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

**In-app purchases:** none


## Frequently asked questions

### Is ISBN free?

ISBN costs $0.99, with no in-app purchases.

### Is Aspose.PDF free?

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

### Do ISBN or Aspose.PDF have ads?

Neither ISBN nor Aspose.PDF shows ads.

### Which is updated more often, ISBN or Aspose.PDF?

ISBN ships an update every 8 months, and Aspose.PDF every 4 weeks. Most recently, ISBN was updated on October 24, 2026 and Aspose.PDF on October 25, 2026.

---

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