# Strap Sentry vs PDF Compressor ・ PDF Converter

The clearest difference is in-app purchases: Strap Sentry at none against PDF Compressor ・ PDF Converter's 10. Strap Sentry also leads on ads (none vs shown). PDF Compressor ・ PDF Converter's advantage is update cadence (every 5 days vs every 3 months) and iOS requirement (15.6 vs 17.4). On price and device support there is nothing between them.

Both are free to download. PDF Compressor ・ PDF Converter sells 9 in-app purchases, starting at $4.99 per 7 days. Strap Sentry asks for nothing beyond the download.

Strap Sentry ships an update every 3 months, PDF Compressor ・ PDF Converter every 5 days. The most recent releases landed on September 17, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Strap Sentry | PDF Compressor ・ PDF Converter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (70 ratings)](https://appshunter.io/ios/app/pdf-compressor-pdf-converter/id6742428142/reviews)** |
| Number of ratings | — | **70** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 5 days** |
| Monetization | — | Free with in-app purchases |
| Size | 14 MB | 41 MB |
| Requires iOS | 17.4 | **15.6** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Strap Sentry Technologies, LLC](https://appshunter.io/developer/1791284564) | [RIJIPUPS OU](https://appshunter.io/developer/1594002879) |

## What reviewers say

### Strap Sentry

[App page](https://appshunter.io/ios/app/strap-sentry/id6740725851)

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

**In-app purchases:** none


### PDF Compressor ・ PDF Converter

[App page](https://appshunter.io/ios/app/pdf-compressor-pdf-converter/id6742428142)

Easily convert, scan, compress, and edit documents into PDFs. This tool offers smart camera features for accurate scanning, flexible compression options to save space, and the ability to merge or convert files. Keep your documents organized and secure with password protection.

**Highlights:** Convert photos, files, and scans to PDF, Smart camera for auto-detection and cropping, Compress PDFs with quality settings, Merge multiple PDFs, Convert PDFs to JPG or ZIP, Password protect sensitive documents, Edit and reorder PDF pages

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF Converter PRO | $4.99 | per 7 days |
| PDF Converter PRO | $6.99 | per 7 days |
| PDF Converter PRO | $6.99 | per 7 days |
| PDF Converter PRO | $6.99 | per 7 days |
| PDF Converter PRO | $7.99 | per 7 days |
| PDF Converter PRO | $11.99 | per month |
| PDF Converter PRO | $19.99 | per month |
| PDF Converter PRO | $99.99 | per year |
| PDF Converter PRO | $119.99 | per year |


## Frequently asked questions

### Is Strap Sentry free?

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

### Is PDF Compressor ・ PDF Converter free?

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

### Do Strap Sentry or PDF Compressor ・ PDF Converter have ads?

PDF Compressor ・ PDF Converter shows ads; Strap Sentry does not.

### Which is updated more often, Strap Sentry or PDF Compressor ・ PDF Converter?

Strap Sentry ships an update every 3 months, and PDF Compressor ・ PDF Converter every 5 days. Most recently, Strap Sentry was updated on September 17, 2026 and PDF Compressor ・ PDF Converter on September 22, 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.*