Last updated: 2026-08-24
11x13 is a mental-math trainer. It is built so that your data stays with you: there are no accounts, no ads, no analytics, and no third-party SDKs.
11x13 does not collect, transmit, or share any personal data with us. There are no servers of our own.
Your practice progress — levels, points, and recent problems — is stored in your personal iCloud key-value storage so it syncs across your devices. This data lives in your Apple account; we have no access to it.
If you sign in to Game Center, your score is submitted to Apple's Game Center leaderboard under your Game Center player profile. This is optional and handled entirely by Apple.
The one-time “Everything” purchase is processed by Apple through the App Store. We never see your payment details. The free-trial start date is stored on your device and in your personal iCloud storage.
11x13 contains no third-party SDKs, no ads, and no tracking of any kind.
Questions about this policy: mhennemeyer@me.com