Stack — Privacy Policy

Last updated: June 18, 2026

Stack collects no data. None.

No account. There is no sign-up or login.
No analytics, no tracking, no advertising, no third-party data collection of any kind.
Your habits, streaks, and progress are stored on your device. If you enable iCloud, they sync through your own private iCloud account (Apple’s CloudKit). We never see, receive, or have access to that data.
Reminders are local notifications scheduled on your device.
We do not sell, share, or transmit any personal information, because we never collect any.

Stack is part of the HSLA0001 suite. This policy covers the Stack app specifically.