# PDF Compressor vs Sphinx 5.0

The clearest difference is in-app purchases: Sphinx 5.0 at none against PDF Compressor's 3. Sphinx 5.0 also leads on ads (none vs shown) and iOS requirement (15.6 vs 17). On price, update cadence and device support there is nothing between them.

Both are free to download. PDF Compressor sells 3 in-app purchases, starting at $1.99 per 7 days. Sphinx 5.0 asks for nothing beyond the download.

PDF Compressor ships an update every 2 weeks, Sphinx 5.0 every 10 days. The most recent releases landed on October 18, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | PDF Compressor | Sphinx 5.0 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | **Every 10 days** |
| Monetization | Free with in-app purchases | — |
| Size | 29 MB | 23 MB |
| Requires iOS | 17 | **15.6** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Etienne Pers](https://appshunter.io/developer/1872476582) | [SHENZHEN KEYKING TECHNOLOGY CO.,LTD.](https://appshunter.io/developer/705079409) |

## What reviewers say

### PDF Compressor

[App page](https://appshunter.io/ios/app/pdf-compressor-convert-photo/id6759563854)

This utility app helps reduce the file size of PDFs, photos, and images. It allows you to compress files for faster uploads, smaller email attachments, and more storage space. You can also merge multiple files into a single PDF.

**Highlights:** Compress PDFs, Compress photos and images, Merge multiple files into one PDF, Adjust compression and quality levels, Preview and share compressed files, Process files locally on device

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF Compressor Pro | $1.99 | per 7 days |
| PDF Compressor Pro | $19.99 | per year |
| PDF Compressor Pro Lifetime | $19.99 | one-time |


### Sphinx 5.0

[App page](https://appshunter.io/ios/app/sphinx-50/id6803020372)

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

**In-app purchases:** none


## Frequently asked questions

### Is PDF Compressor free?

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

### Is Sphinx 5.0 free?

Sphinx 5.0 is free to download, with no in-app purchases.

### Do PDF Compressor or Sphinx 5.0 have ads?

PDF Compressor shows ads; Sphinx 5.0 does not.

### Which is updated more often, PDF Compressor or Sphinx 5.0?

PDF Compressor ships an update every 2 weeks, and Sphinx 5.0 every 10 days. Most recently, PDF Compressor was updated on October 18, 2026 and Sphinx 5.0 on October 15, 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.*