Comparison

PDF Reader vs Knife Sharpening

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

Head to head
About

PDF Reader

Features
Read full description

- Read PDFs Without Touching the Screen AutoScroll PDF Reader lets you read documents effortlessly. Pages scroll automatically at your pace, so you can focus on content β€” not swiping. Perfect for students, professionals, and anyone who reads long PDFs. - Key Features Auto-Scroll Reading Smooth automatic scrolling Adjustable speed to match your reading style Ideal for hands-free reading Document Scanner Scan physical documents using your camera Convert scans into clean PDFs instantly Save and read scanned documents inside the app Smart PDF Reader Fast and lightweight Works with large PDF files Clean, distraction-free interface Designed for Focus Minimal UI No clutter Built for long reading sessions -Who Is This For? Students reading notes and textbooks Professionals reviewing documents Anyone tired of constant scrolling -Privacy Friendly Your documents stay on your device. We don’t upload or track your files. - Simple. Fast. Useful. If you read PDFs every day, this is the reader you’ll love.

About

Knife Sharpening

Features
Read full description

A well-sharpened blade is easy to appreciate, yet the small moments behind it are often forgotten. The stone that worked especially well, the condition of the edge before sharpening, or the afternoon spent bringing an old tool back into use quietly disappear as newer tasks take their place. After enough time, even familiar knives begin to blur together, making it difficult to remember what was done and when. A personal collection gives every blade its own identity without turning the process into paperwork. Categories naturally separate kitchen knives, outdoor equipment, workshop tools, and everyday favorites, while photographs preserve details that words rarely capture. Sharpening dates remain connected to each item, creating a clear history that is pleasant to revisit before the next session. Looking through earlier entries often recalls not only the work itself but also the satisfaction of restoring something with patience and attention. Little by little, the collection becomes a reflection of craftsmanship, quiet practice, and respect for tools that continue to serve year after year.

Screenshots

PDF Reader4 screens
Knife Sharpening4 screens

Verdict

The call

The clearest difference is in-app purchases: Knife Sharpening at none against PDF Reader's 1. Knife Sharpening also leads on ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. PDF Reader sells 1 one-off in-app purchase. Knife Sharpening asks for nothing beyond the download.

Scorecard2 real differences Β· 4 level
PDF Reader versus Knife Sharpening: the parameters behind the verdict, then further details
ParameterPDF ReaderKnife Sharpening
PriceFreeFree
Update frequencyWeeklyβ€”
AdsYesNo β€” better
In-app purchasesYesNo β€” better
DevicesiPhone, iPad β€” betteriPhone
Requires iOS16.616.0 β€” better
Further details β€” not scored
Size9 MB4 MB
Age rating12+4+
DeveloperRajesh RayJack Kelley

In-app purchases

1 purchases

PDF Reader

One-time1
  • Premium Lifetime$9.99
None

Knife Sharpening

No in-app purchases

Questions

Is PDF Reader free?
PDF Reader is free to download, with in-app purchases available.
Is Knife Sharpening free?
Knife Sharpening is free to download, with no in-app purchases.
Do PDF Reader or Knife Sharpening have ads?
PDF Reader shows ads; Knife Sharpening does not.

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