Privacy Policy

Effective 29 October 2026

Ensō Sudoku does not collect, store or share any personal data. There is nothing to sign up for and nothing is sent anywhere.

What the app keeps on your device

• Your current game: the puzzle, your digits and notes, the timer, and a history of your moves so undo, redo and hints work. Only one game is kept; starting a new one replaces it.
• Your settings: mistake checking, sound and haptics.

This data is stored only in the app's private storage on your iPhone or iPad. We never receive it and cannot access it. Like any app data, it may be included in your device's iCloud or computer backups if you have backups turned on; those are handled by Apple under your own Apple account settings.

What the app does not do

• It makes no network connections. Puzzles are generated on your device.
• It has no accounts, sign-in or cloud sync.
• It contains no analytics, advertising, crash-reporting or other third-party SDKs.
• It does not track you across apps or websites and does not use the advertising identifier.
• It does not access your contacts, photos, location, camera, microphone or any other personal information.

Deleting your data

Deleting Ensō Sudoku from your device removes your saved game and settings permanently.

Children

Ensō Sudoku is suitable for all ages. Because it collects no data from anyone, it collects no data from children.

This website

ensosudoku.com uses no cookies, analytics or third-party scripts and loads no external fonts. Like any website, our hosting provider may briefly process technical information such as your IP address to deliver pages and protect against abuse; we do not use it to identify or track you.

Feedback by email

If you email us, we use your address and message only to reply, and we do not share them.

Changes

If this policy changes, for example when optional features are added in a future version, we will update this page and its effective date before the change ships.

Contact

Questions about privacy: hello@ensosudoku.com.