Comparison

PDF Pro vs Plainsight

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

Head to head
About

PDF Pro

This app is a comprehensive document management tool for handling PDFs and other file types. It allows users to scan, annotate, sign, merge images into PDFs, and quickly search and favorite files. Enjoy efficient mobile productivity with a user-friendly interface.

Highlights
  • Multi-format document support (PDF, Word, Excel, PPT)
  • Scan documents to PDF
  • Annotate PDFs with highlighting and drawing
  • Digitally sign documents
  • Merge images into PDF
  • Quick file search and favorites
Features
Read full description

**PDF Pro - Doc & Mark: Your All-in-One Document Viewer for Easy Management!** PDF Pro - Doc & Mark is a professional document management tool designed to help you handle your PDFs quickly and efficiently. Whether you're scanning paper documents, reading files, annotating pages, or signing contracts, this app delivers essential PDF features in a clean and easy-to-use interface. **Key Features** ** Multi-Format Support** Supports PDF, Word, Excel, PPT, and more to meet all your document viewing needs. Open and read various file types effortlessly, enabling efficient work on the go. **Scan documents** Just take a photo and it can help you scan and save it as a PDF file for easy sharing or archiving. **PDF Markup Tools** Highlight key text, underline content, draw freely, and add comments with flexible annotation options. Whether you're reviewing reports or studying materials, these tools let you write notes, edit, and give feedback directly on the page. **Sign Documents Anytime** No need to print or scan—add legally accepted e-signatures to your PDF files. Supports handwritten digital signatures or stored signature images, so you can quickly sign forms, agreements, and business documents right on your device. **Merge images into PDF** Supports merging multiple images into PDF, helping you quickly merge receipts or organize scanned documents. **File Search** Find documents quickly, saving you time. Use keywords to locate specific files instantly, even if you have a large collection. **File Favorites** Add frequently used or important files to your favorites for quick access. No need for repeated searches—just tap to open saved files, easily and conveniently! **Smooth Preview** Enjoy fast, seamless document previews, ensuring smooth browsing of large and multi-page files. Supports zoom and scroll for high-quality document viewing. Why Choose PDF Pro - Doc & Mark? **Quick Opening**: No waiting—load file content fast for immediate access. **User-Friendly Interface**: A simple, intuitive design that helps users quickly get started and manage files with ease. **Saves Storage Space**: Compact app size ensures it won’t take up too much phone storage, leaving more space for your needs. PDF Pro - Doc & Mark is focused on providing an efficient, easy-to-use reading and management experience, making mobile productivity simpler! Download PDF Pro - Doc & Mark now and enjoy convenient document management!

About

Plainsight

Features
Read full description

PlainSight: The Disguised Note Vault Keep your most sensitive notes completely invisible to everyone else. No obvious PIN pads. No suspicious lock screens. Just total privacy, hidden in plain sight. PlainSight looks and functions like a beautiful, minimal note-taking app on the surface—perfect for daily tasks, grocery lists, and quick thoughts. But underneath its calm interface holds a powerful secret. By typing your own custom secret command phrase directly into a standard note field, PlainSight instantly unlocks your hidden workspaces. To an outside observer or anyone browsing your phone, your private vaults don't even exist. HOW IT WORKS: THE SECRET KNOCK CREATE YOUR TRIGGER Choose absolutely any secret phrase or word like .banana, ..manage, or a custom string of text. TYPE TO REVEAL Type your secret phrase anywhere in the text field to instantly slide open your private workspaces. TOTAL PLAUSIBLE DENIABILITY PlainSight doesn't broadcast that you have something to hide. There are no "Incorrect Password" errors or biometric pop-ups to raise suspicion if you hand your phone to a friend, colleague, or family member. POWERFUL PRIVACY, MINIMALIST DESIGN WRITE WITH CLARITY Open instantly into a clean, distraction-free editor. No toolbars, no clutter—just a smooth, fast writing space that stays out of your way. ORGANIZE EFFORTLESSLY Group your sensitive data using lightweight tags and categories. Keep your personal journals, account numbers, business ideas, or travel itineraries meticulously structured. SECURE EMAIL RECOVERY Forget your secret word? Don't panic. You can securely reset your access via an encrypted recovery code sent to your email. Your notes remain completely local, encrypted, and yours—but you'll never be locked out. SECURE REAL-TIME COLLABORATION Need to share a shopping list with a partner or collaborate on a private project with a teammate? Turn any workspace into a shared space. PlainSight syncs instantly across devices in real time, giving you seamless multi-user collaboration without the bloat of heavy corporate productivity tools. FEATURES BUILT TO STAY INVISIBLE Fast writing tools and clean formatting Custom tags and categories Real-time multi-user collaboration Archive, delete, and restore controls Secure workspace management Smooth, instant cloud sync NO SUBSCRIPTIONS. NO SURPRISES. PlainSight is fully free for simple, personal note-taking. If you want advanced power—including multi-user shared workspaces, unlimited hidden spaces, and full real-time cloud sync across devices—unlock everything with a single, small, one-time upgrade. No monthly fees, ever. Protect your thoughts with absolute discretion. Download PlainSight and secure your notes today.

Screenshots

PDF Pro4 screens
Plainsight4 screens

Verdict

The call

The clearest difference is ads: Plainsight at none against PDF Pro's shown. On price, update cadence, in-app purchases and device support 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

Both are free to download. PDF Pro sells 7 in-app purchases, starting at $5.99 per 7 days and Plainsight sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

PDF Pro ships an update every 9 days, Plainsight every 2 weeks. The most recent releases landed on September 17, 2026 and September 10, 2026 respectively.

Scorecard1 real difference · 8 level
PDF Pro versus Plainsight: the parameters behind the verdict, then further details
ParameterPDF ProPlainsight
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 9 days — betterEvery 2 weeks
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhoneiPhone, iPod — better
Requires iOS16.015.0 — better
Further details — not scored
Size79 MB27 MB
Age rating4+4+
DeveloperAPPSKY HONG KONG LIMITEDRanjan Ghimire

In-app purchases

7 purchases

PDF Pro

Subscriptions7
  • PDF Pro$5.997 Days
  • PDF Pro$6.997 Days
  • PDF Pro3 Days trial$6.997 Days
Show 4 more
  • PDF Pro$19.991 Month
  • PDF Pro3 Days trial$49.991 Year
  • PDF Pro3 Days trial$59.991 Year
  • PDF Pro$59.991 Year
1 purchases

Plainsight

One-time1
  • Plainsight - Private Notes$4.99

Questions

Is PDF Pro free?
PDF Pro is free to download, with in-app purchases available.
Is Plainsight free?
Plainsight is free to download, with in-app purchases available.
Do PDF Pro or Plainsight have ads?
PDF Pro shows ads; Plainsight does not.
Which is updated more often, PDF Pro or Plainsight?
PDF Pro ships an update every 9 days, and Plainsight every 2 weeks. Most recently, PDF Pro was updated on September 17, 2026 and Plainsight on September 10, 2026.

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