# Sentinel IO vs PDF Scanner

The clearest difference is update cadence: PDF Scanner at every 4 days against Sentinel IO's every 11 days. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Sentinel IO ships an update every 11 days, PDF Scanner every 4 days. The most recent releases landed on October 19, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Sentinel IO | PDF Scanner |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (9 ratings)](https://appshunter.io/ios/app/pdf-scanner-scany/id6795656749/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | — | 80.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 days | **Every 4 days** |
| Monetization | — | Free |
| Size | 36 MB | 28 MB |
| Requires iOS | **15.1** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sentinel IO](https://appshunter.io/developer/1835680432) | [Josip Valcic](https://appshunter.io/developer/1626990788) |

## What reviewers say

### Sentinel IO

[App page](https://appshunter.io/ios/app/sentinel-io/id6751542701)

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

**In-app purchases:** none


### PDF Scanner

[App page](https://appshunter.io/ios/app/pdf-scanner-scany/id6795656749)

Effortlessly transform documents, receipts, and photos into high-quality PDFs. This free scanner app offers automatic cropping, perspective correction, and enhancement modes for clean, shareable files. Organize your scans with folders and tags for easy retrieval.

**Highlights:** Scan documents, receipts, and photos, Automatic cropping and perspective correction, Enhancement modes for clarity, Create multi-page PDFs, Organize scans with folders and tags, Export and share PDF files

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

**In-app purchases:** none


## Frequently asked questions

### Is Sentinel IO free?

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

### Is PDF Scanner free?

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

### Do Sentinel IO or PDF Scanner have ads?

Neither Sentinel IO nor PDF Scanner shows ads.

### Which is updated more often, Sentinel IO or PDF Scanner?

Sentinel IO ships an update every 11 days, and PDF Scanner every 4 days. Most recently, Sentinel IO was updated on October 19, 2026 and PDF Scanner 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.*