# Mail Sentinel vs PDF Master

Mail Sentinel and PDF Master are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

## The numbers

| Metric | Mail Sentinel | PDF Master |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pdf-master-all-in-one-tools/id6773182044/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Monetization | — | Free |
| Size | 4 MB | 2 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sky Benson](https://appshunter.io/developer/1839805807) | [Nguyen Hoang Tung](https://appshunter.io/developer/6773182046) |

## What reviewers say

### Mail Sentinel

[App page](https://appshunter.io/ios/app/mail-sentinel/id6757452962)

**Features:** macOS Compatibility

**In-app purchases:** none


### PDF Master

[App page](https://appshunter.io/ios/app/pdf-master-all-in-one-tools/id6773182044)

This comprehensive tool allows users to scan, edit, annotate, sign, convert, merge, split, compress, and protect PDF documents. It offers OCR for searchable scans, AI summarization and chat, and secure password protection. Designed for iOS, it provides a fast and native user experience.

**Highlights:** Scan documents to searchable PDFs with OCR, Edit PDFs with highlights, drawings, and text, Sign documents with digital signatures, Convert PDFs to/from Word, Excel, PowerPoint, and images, Merge, split, compress, and rotate PDFs, Password-protect and secure documents, AI summarization and document chat

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

**In-app purchases:** none


## Frequently asked questions

### Is Mail Sentinel free?

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

### Is PDF Master free?

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

### Do Mail Sentinel or PDF Master have ads?

Neither Mail Sentinel nor PDF Master shows ads.

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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.*