SizeItUp vs sDoku
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
SizeItUp compared with sDoku
| Detail | 
SizeItUp | 
sDoku |
|---|
| What it does | A free daily size comparison game about your sense of scale
| A sudoku app printed like a vintage newspaper with daily puzzles and league tables
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| Stage | Not given
| Startup
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| Founded | Not given
| 2024
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| Based in | US
| SK
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| Pricing model | Free
| Freemium
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| Pricing | Not given
| Free: daily puzzle, 3 archive puzzles per day, 3 editor corrections per day. Press pass: monthly or yearly subscription, or one-time Patron edition for unlimited archive puzzles and unlimited editor corrections.
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| Key features | - Five daily games with unique themes and leaderboards
- Interactive resizing with visual feedback
- Sourced answers with links to primary sources
- Daily leaderboard ranking system
- Unlimited free play mode
- Archive to replay past puzzles
- Google account sign-in for streak tracking
- Scoring system based on accuracy ratio
- Cosmetic customization with titles and board themes
| - Archive of puzzles in four difficulty levels
- Pencil marks for note-taking
- Public league tables ranking solve times
- Editor hints and corrections
- Press cuttings with long-term achievement goals
- Multiple paper stock designs
- Fully offline functionality
- Data export and account deletion
- Cross-device synchronization with free account
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| What makes it different | - Every size is sourced to primary references like NASA, ISO standards, and peer-reviewed studies
- Real size visual comparison without conversion to other units
- Fair scoring based on ratio rather than absolute difference
- Completely free with no pay-to-win mechanics
- Five diverse game categories spanning everyday, cosmic, prehistoric, culinary and microscopic scales
| - Vintage newspaper-style design with serif masthead and rubber stamp interface
- Shared daily puzzle creating a community experience
- Complete privacy with no ads or third-party trackers
- Fully functional offline with on-device data storage
- Difficulty graded by actual solving techniques rather than clue counts
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 20 ▼ −4 (down) since last check | 21 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 0 |
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| Citation Flow (Majestic) | 0 | 20 |
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| Referring domains (Majestic) | 0 | 10 |
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5 details filled in for both companies.
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