Comparison

Sudoku² vs PDF Watch Viewer

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

Head to head
About

Sudoku²

Engage with an endless supply of Sudoku puzzles, ranging from easy to challenging difficulty levels. Features include a distraction-free input pad, note-taking with color options, and customizable error checking. Unlock new levels by completing a single puzzle.

Highlights
  • Infinite Sudoku puzzles
  • Adjustable difficulty levels
  • Distraction-free input pad
  • Color-coded note-taking
  • Manual/automatic note-taking
  • Customizable error checking
  • Multiple highlight modes
Features
Read full description

Infinite free Sudoku puzzles with levels from Easy to Evil! Key features: -Solve just one puzzle to unlock next level -Input pad with no distractions -Redo/Undo -Taking/Erasing notes with different colors -Taking notes manually or automatically -Error check can be enabled or disabled -Multiple highlight mode

About

PDF Watch Viewer

View PDF, Word, Excel, and text files directly on your Apple Watch. Easily navigate, zoom, and organize documents for quick access on the go. Syncs seamlessly with your iPhone for offline viewing.

Highlights
  • PDF, Word, Excel, Text file support
  • Zoom and page navigation
  • Favorites and collections
  • Seamless iPhone sync
  • Offline access
  • Image and notes support
Features
Read full description

WristDocs is the easiest way to view your PDF, Word (DOCX), Excel, EPUB and text files (TXT) directly on your Apple Watch. Whether it's a quick glance at a presentation, a travel itinerary, or important notes on the go — WristDocs keeps everything just a tap away. With an elegant and intuitive design, you can scroll through pages, zoom in and out, jump to specific pages, and manage your files — all from your wrist. Perfect For: • Checking study slides or class notes. • Viewing boarding passes or hotel reservations hands-free • Reading instructions, schedules, or reminders instantly Key Features • PDF, Word, Excel, Text & EPUB File Support Import and view multiple PDFs, DOCX, XLSX, or TXT documents. All directly from your watch. • Zoom & Page Navigation Easily zoom in/out and jump between pages with smooth controls designed for small screens. • Favorites & Collections Organize your documents into folders like "Work", "Lectures", or "Travel", and mark key files as favorites for quick access. • Seamless iPhone Sync Manage your documents using the iPhone app and sync them to your Watch in seconds. • Offline Access Access your files on Apple Watch even when your iPhone isn’t nearby. • File Conversion Tools Convert images and notes into PDF format directly within the iPhone app. • Photos and Notes Support Need quick access to a photo or a reminder? You can also send images and plain text notes to your Watch when needed. Terms & Conditions: https://www.notion.so/Terms-Conditions-2d0686c61ac480f69571f5b5cd98e36b Privacy Policy: https://www.notion.so/Privacy-Policy-2d0686c61ac480fc9639c97c690b1b71

Screenshots

Sudoku²4 screens
PDF Watch Viewer4 screens

Verdict

The call

The clearest difference is review sentiment: Sudoku² at 81% against PDF Watch Viewer's 32%. Sudoku² also leads on device support (4 vs 2) and iOS requirement (12.0 vs 17.0). PDF Watch Viewer's advantage is rating (4.6 vs 3.9) and ads (none vs shown). On price, in-app purchases and monetization model 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. Sudoku² sells 1 one-off in-app purchase and PDF Watch Viewer sells 9 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

PDF Watch Viewer holds the better App Store score, 4.6 against 3.9. That said, the two scores are not equally well evidenced: PDF Watch Viewer has 397 ratings behind it against 10, so its average is the more settled of the two. Written reviews complicate that: 81% of Sudoku²'s written reviews are positive against 32% of PDF Watch Viewer's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Sudoku² ships an update every 4 months, PDF Watch Viewer fortnightly. The most recent releases landed on October 23, 2026 and October 30, 2026 respectively.

Scorecard7 real differences · 3 level
Sudoku² versus PDF Watch Viewer: the parameters behind the verdict, then further details
ParameterSudoku²PDF Watch Viewer
PriceFreeFree
Rating3.9 (10 ratings)4.6 (397 ratings) — better
Positive reviews80.8% of reviews — better31.9% of reviews
Number of ratings10397 — better
Update frequencyEvery 4 monthsFortnightly — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, Apple Watch
Requires iOS12.0 — better17.0
Further details — not scored
Size6 MB84 MB
Age rating4+4+
Developer春 李ONNEX YAZILIM ANONIM SIRKETI

Customer experience

Sudoku²

All ratings10 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews26 reviews
Positive80.8%
Neutral7.7%
Negative11.5%

PDF Watch Viewer

All ratings395 ratings
Positive88.4%
Neutral3.0%
Negative8.6%
Written reviews94 reviews
Positive31.9%
Neutral5.3%
Negative62.8%

In-app purchases

1 purchases

Sudoku²

One-time1
  • Remove Advertisement$0.99
9 purchases

PDF Watch Viewer

Subscriptions7
  • Weekly Subscription$4.997 Days
  • Weekly Subscription3 Days trial$6.997 Days
  • WristDocs Six Months Premium$9.996 Months
Show 4 more
  • Monthly Subscription$9.991 Month
  • 6-Month Premium$14.996 Months
  • Annual Subscription$19.991 Year
  • Annual Subscription$29.991 Year
One-time2
  • Lifetime Access$29.99
  • Lifetime Premium Access$59.99

Questions

Is Sudoku² free?
Sudoku² is free to download, with in-app purchases available.
Is PDF Watch Viewer free?
PDF Watch Viewer is free to download, with in-app purchases available.
Which has better reviews, Sudoku² or PDF Watch Viewer?
PDF Watch Viewer is rated higher. Sudoku² averages 3.9 out of 5 from 10 ratings, while PDF Watch Viewer averages 4.6 from 397 ratings.
Do Sudoku² or PDF Watch Viewer have ads?
Sudoku² shows ads; PDF Watch Viewer does not.
Which is updated more often, Sudoku² or PDF Watch Viewer?
Sudoku² ships an update every 4 months, and PDF Watch Viewer fortnightly. Most recently, Sudoku² was updated on October 23, 2026 and PDF Watch Viewer on October 30, 2026.

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