Comparison

Sudoku Checker vs Quick3D CAD Viewer

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

Head to head
About

Sudoku Checker

This app allows you to input numbers from a physical Sudoku puzzle and verifies its validity. It identifies single solutions, multiple solutions, or contradictions. The app displays your input in black and derived numbers in gray.

Highlights
  • Input hand-written Sudoku numbers
  • Displays derived numbers in gray
  • Verifies puzzle validity
  • Detects single/multiple solutions
  • Identifies contradictions
Features
Read full description

When launched, an empty number place table will appear. At first everything is "?". Enter the number of your own number place here. The entered numbers are displayed in black. If there are numbers that can be derived from the entered numbers, they will be displayed in gray. After completing the input, touch the [Verify] button to obtain the results. ・ When only one solution can be derived ・ When there are multiple solutions ・ When contradiction occurs The results are shown in the three dialogs of. At the moment, the ability to load your own number places with your camera and to capture from photos is not yet implemented. Display the ad at the bottom of the screen.

About

Quick3D CAD Viewer

Features
Read full description

Quick3D Viewer 3D CAD Viewing Made Simple. Quick3D Viewer is a free 3D model viewer for iPhone and iPad. Open and explore a wide range of 3D files, including STEP, IGES, STL, OBJ, and more, right from your mobile device. Whether you're on the factory floor, meeting with clients, or away from your desk, Quick3D Viewer makes it easy to inspect 3D models wherever you go. Key Features ■ Supports Multiple 3D File Formats View STEP / STP, IGES / IGS, STL, OBJ, PLY, 3MF, GLB, and USDZ files. ■ Intuitive 3D Navigation Rotate, zoom, and pan models using simple touch gestures. Explore your designs from different angles. ■ Full-Screen Viewing Hide banner ads in full-screen mode and enjoy more space to inspect your 3D models. ■ Designed for iPhone and iPad View 3D models on your phone or tablet, wherever your work takes you. Perfect For - Inspecting 3D models on the factory floor - Reviewing CAD designs and engineering projects - Sharing designs during meetings - Checking models for 3D printing - Viewing CAD files while on the go 3D CAD in Your Pocket. Make 3D viewing easier with Quick3D Viewer.

Screenshots

Sudoku Checker4 screens
Quick3D CAD Viewer4 screens

Verdict

The call

The clearest difference is ads: Sudoku Checker at none against Quick3D CAD Viewer's shown. Sudoku Checker also leads on iOS requirement (9.0 vs 18.6). Quick3D CAD Viewer's advantage is update cadence (every 2 weeks vs every 2 months). On price, 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Sudoku Checker ships an update every 2 months, Quick3D CAD Viewer every 2 weeks. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.

Scorecard3 real differences · 7 level
Sudoku Checker versus Quick3D CAD Viewer: the parameters behind the verdict, then further details
ParameterSudoku CheckerQuick3D CAD Viewer
PriceFreeFree
Rating4.3 (4 ratings) — better—
Positive reviews85.7% of reviews—
Number of ratings4 — better—
Update frequencyEvery 2 monthsEvery 2 weeks — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS9.0 — better18.6
Further details — not scored
Size23 MB28 MB
Age rating4+4+
DeveloperAtsuo KazamaRyo Tazaki

In-app purchases

None

Sudoku Checker

No in-app purchases

None

Quick3D CAD Viewer

No in-app purchases

Questions

Is Sudoku Checker free?
Sudoku Checker is free to download, with no in-app purchases.
Is Quick3D CAD Viewer free?
Quick3D CAD Viewer is free to download, with no in-app purchases.
Do Sudoku Checker or Quick3D CAD Viewer have ads?
Quick3D CAD Viewer shows ads; Sudoku Checker does not.
Which is updated more often, Sudoku Checker or Quick3D CAD Viewer?
Sudoku Checker ships an update every 2 months, and Quick3D CAD Viewer every 2 weeks. Most recently, Sudoku Checker was updated on October 24, 2026 and Quick3D CAD Viewer on October 29, 2026.

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