Calm Sudoku · 静心数独
No ads ever. Large-print.
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
1,500 free puzzles, large numbers and no ads. Explore Expert and the new Master difficulty with Premium.
Calm Sudoku is a quiet, ad-free sudoku app built for everyday focus and unwinding. It is comfortable for first-time solvers, longtime sudoku fans, and anyone who wants a cleaner, easier-to-read puzzle experience.
No ads. Not now, not later. The free experience is calm by design.
WHAT'S INSIDE
• Daily Puzzle: one fresh sudoku every day
• Five difficulty levels, including Expert and Master with Premium
• 1,500 free puzzles: 500 each in Easy, Medium and Hard
• Smart hints: see the logic, not just the answer
• Notes mode: pencil in candidates with one tap
• Auto-save: leave and continue any puzzle later
• Personal stats: best times, streaks, and weekly activity
• Localized interface in 35 supported languages
• Large, readable numbers with calm color themes
• Offline play: puzzles and progress stay on your device
DESIGNED FOR COMFORT
Calm Sudoku is made to be readable in low light, gentle on the eyes, and forgiving when you tap the wrong cell. The board uses generous spacing, clear contrast, and large digits so you can focus on the puzzle instead of the interface.
CALM SUDOKU PREMIUM
A one-time purchase, with no subscription, unlocks Expert and Master with 500 puzzles each, unlimited hints and advanced statistics. Existing Premium owners receive Master at no additional cost.
Premium is a single purchase. No subscription. No auto-renewal.
PRIVACY
Calm Sudoku does not collect, store, or transmit personal data. No account, no analytics, no tracking. Progress stays on your device.
Questions or feedback? Email team.emitu@gmail.com.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• New Master difficulty with 500 puzzles, included with Premium. If you already own Premium, no additional purchase is needed.
• Easy, Medium and Hard now offer all 500 puzzles each for free. The previous 50-puzzle limit has been removed.
The developer, Yishu Gu, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Yishu Gu
- Size
- 24.8 MB
- Category
- Puzzle
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 33 more
- English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Estonian, Finnish, French, German, Greek, Hungarian, Indonesian, Italian, Japanese, Korean, Latvian, Lithuanian, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Slovenian, Spanish, Swedish, Traditional Chinese, Turkish, Ukrainian, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Calm Sudoku Premium $4.99
- Copyright
- © 2026 Yishu Gu