Comparison

PDF File Protector vs Whois Master

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

PDF File Protector

Features
Read full description

Worried about sensitive PDFs being shared freely or leaked? Want to add a unique identifier to your important documents?  PDF File Protector is your professional document security assistant!  Safeguard your document security and copyright comprehensively with powerful watermarking, signing, and encryption features. [All-in-One Core Features] • Effortless Watermarking Add text or image watermarks with customizable content, size, opacity, and rotation. Stamp exclusive identifiers on contracts, designs, or internal materials to prevent unauthorized use and distribution, asserting your ownership. • Secure E-Signature Support for direct handwritten signatures, placed precisely anywhere in the document. Perfect for approving contracts, confirming orders, or signing agreements—get it done quickly without the hassle of printing and scanning. • Powerful PDF Encryption Set a high-strength password to open the PDF, preventing unauthorized access. Effectively prevents data leaks caused by device loss or accidental file sharing, locking down your privacy and trade secrets. [App Highlights] Simple Operation: No expertise needed. Professional-level protection is just a few taps away. Fully Offline: All processing is done locally on your device. Your files are never uploaded, guaranteeing privacy and security. High-Quality Output: Maintains the original file's clarity and quality without compromising the reading experience. Perfect For: Business Professionals: Protect confidential company reports and contract documents. Designers/Creators: Add copyright watermarks to portfolios and design drafts. General Users: Encrypt important personal documents like IDs, resumes, and bank statements. Download PDF File Protector today! Hold professional-grade security measures in the palm of your hand. Share files with peace of mind! — Privacy Policy please visit: Privacy Policy: https://docs.qq.com/doc/DRFZnV2JkVGVSUWVU Terms of Service: https://docs.qq.com/doc/DREdRb0VqQUFETVhq Apple EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ If you have any questions, feel free to contact us anytime: hxx_shdt@126.com

About

Whois Master

This utility app allows users to perform comprehensive web lookups. It provides access to domain information, DNS records, SSL certificate details, and IP address tracking. It's designed to be a fast, reliable, and user-friendly tool for exploring essential web data.

Highlights
  • Domain lookups
  • DNS record access
  • SSL certificate details
  • IP address tracking
  • User-friendly interface
Features
Read full description

Easily perform domain lookups, access DNS records, check SSL certificate details, and track IP addresses! Fast, reliable, and user-friendly, your all-in-one solution for exploring the web's essential data is here!

Screenshots

PDF File Protector3 screens
Whois Master4 screens

Verdict

The call

The clearest difference is price: Whois Master at $0.59 against PDF File Protector's $19.99. Whois Master also leads on in-app purchases (none vs 1) and update cadence (every 2 weeks vs every 2 months). On ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

PDF File Protector costs $19.99 and Whois Master $0.59 up front. PDF File Protector sells 1 one-off in-app purchase. Whois Master asks for nothing beyond the download.

UpkeepUpdate frequency

PDF File Protector ships an update every 2 months, Whois Master every 2 weeks. The most recent releases landed on September 26, 2026 and September 19, 2026 respectively.

Scorecard3 real differences · 5 level
PDF File Protector versus Whois Master: the parameters behind the verdict, then further details
ParameterPDF File ProtectorWhois Master
Price$19.99$0.59 — better
Positive reviews—100.0% of reviews
Update frequencyEvery 2 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesYesNo — better
Monetization—Paid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.615.6 — better
Further details — not scored
Size7 MB4 MB
Age rating4+4+
Developer乐祥 胡Emre Keles

In-app purchases

1 purchases

PDF File Protector

One-time1
  • pdf签名内购$9.99
None

Whois Master

No in-app purchases

Questions

Is PDF File Protector free?
PDF File Protector costs $19.99, and also offers in-app purchases.
Is Whois Master free?
Whois Master costs $0.59, with no in-app purchases.
Do PDF File Protector or Whois Master have ads?
Neither PDF File Protector nor Whois Master shows ads.
Which is updated more often, PDF File Protector or Whois Master?
PDF File Protector ships an update every 2 months, and Whois Master every 2 weeks. Most recently, PDF File Protector was updated on September 26, 2026 and Whois Master on September 19, 2026.

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