Privacy Policy

Calm Sudoku · Last updated 25 June 2026

Data Not Collected. Calm Sudoku does not collect, store, transmit, or share any personal data. There are no accounts, no analytics, no advertising, and no tracking of any kind.

What stays on your device

Your games in progress, completion history, best times, and settings are stored locally on your iPhone or iPad. They are never sent to us or to any third party. We operate no servers and have no ability to see how you play. This data stays on your device until you reset it from within the app or delete the app; we cannot access, retrieve, or delete it remotely. If you use iCloud Backup, this on-device data may be included in your own iCloud backup — that backup belongs to you and is not accessible to us.

The one off-device interaction

If you choose to buy the one-time lifetime unlock, the purchase is handled entirely by Apple through the App Store. Apple — not Calm Sudoku — processes the payment and ties the purchase to your Apple ID so it can restore across your devices. We never receive your name, email, payment details, or any identifying information; we only receive Apple's confirmation that the purchase is valid. Apple's handling of that transaction is covered by Apple's Privacy Policy.

No tracking, no ads, no third parties

• No advertising and no ad networks.
• No analytics or crash-reporting SDKs.
• No cookies, identifiers, or fingerprinting.
• No data brokers and no third-party SDKs that collect data.

Children

Calm Sudoku is suitable for all ages and is rated 4+. Because it collects no data from anyone, it collects no data from children.

Changes

If this policy ever changes, the updated version will be posted on this page with a new date. Because the app is offline and collects nothing, we expect changes to be rare.

Contact

Questions about privacy? Email [email protected].