Mail Sentinel vs PDF Master
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Mail Sentinel
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Take control of your inbox with Mail Sentinel - the powerful email scanner that helps you find hidden subscriptions, detect sensitive credentials, and protect your digital privacy. KEY FEATURES: • Smart Email Scanning Automatically scan your inbox to discover mailing lists, newsletters, and subscriptions you've accumulated over the years. • Password Detection Identify emails containing usernames and passwords - like welcome emails and account confirmations. • Credential Alerts Get notified about emails containing sensitive information like OTP codes, verification links, and security alerts. • One-Tap Unsubscribe Quickly unsubscribe from unwanted mailing lists with direct links to unsubscribe pages. • Secure by Design Your credentials are stored safely in your device's Keychain. We never store your emails permanently. • Google Sign-In Support Connect your Gmail account securely with Google OAuth - no app passwords needed. Stop drowning in unwanted emails. Download Mail Sentinel today.
PDF Master
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.
- 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
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PDF Tools Editor is the only PDF app you will ever need on iPhone. Scan, view, edit, annotate, sign, convert, merge, split, compress, and protect — every PDF task in one beautifully designed app. EVERYTHING YOU CAN DO WITH PDFs SCAN ANYTHING TO PDF Auto-detect document edges with your camera. Capture multi-page scans into a single crisp PDF. Choose color, grayscale, or black-and-white modes. Built-in OCR makes every scan searchable. POWERFUL PDF EDITOR Highlight text in twelve colors. Draw freehand with adjustable pen widths. Add text using custom fonts and sizes. Insert shapes such as rectangle, circle, and line. Place handwritten signatures anywhere on the page. Recolor any annotation in one tap. Apply multi-page annotations such as highlights that span across pages. Undo or redo every change. Resize and rotate any element. SIGN PDFs LIKE A PRO Draw your signature with finger or Apple Pencil. Save signatures for reuse. Place them on any page with a single tap. Capture works correctly in both light and dark mode without changing your ink color. CONVERT PDF AND BACK AGAIN Convert PDF to Word using real on-device RTF conversion. Convert PDF to images, Excel, or PowerPoint. Convert Word, Excel, PowerPoint, and images back to PDF. Choose the page size when converting images. Edit converted Word files inside the app. ORGANIZE AND MANAGE Merge multiple PDFs into one. Split a PDF by page ranges. Compress files to shrink size. Rotate pages individually. Add page numbers automatically. Add custom watermarks. Multi-select files for batch share or delete. SECURE YOUR DOCUMENTS Password-protect any PDF. Remove passwords from your own PDFs. Files stay on your device by default — nothing is uploaded. AI ASSISTANT AI Summarize condenses long PDFs into key points. AI Chat lets you ask questions about your document. Save summaries as new PDFs in your library. THIRTEEN LANGUAGES English, Vietnamese, Spanish, Portuguese (BR), French, German, Italian, Japanese, Korean, Simplified Chinese, Hindi, Arabic, Indonesian, Thai, and Turkish. DESIGNED FOR iOS System Light and Dark mode with manual override. Native gestures including swipe to delete and multi-select. Edge-to-edge layout that feels truly native. Fast performance — every action completes in under 200 milliseconds. WHO IT IS FOR Students annotating lecture PDFs. Professionals signing contracts on the go. Freelancers turning receipts into searchable PDFs. Anyone who deals with documents that need to be reviewed, signed, or shared. Download now and bring your PDF workflow up to speed. For questions or feedback, open Settings inside the app and tap Share App.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Mail Sentinel | PDF Master |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 4 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Sky Benson | Nguyen Hoang Tung |
In-app purchases
Mail Sentinel
No in-app purchases
PDF Master
No in-app purchases









