Privacy Policy

Information Stak handles

• Account information: If you connect Google or Apple, Stak receives a provider account identifier and any email address the provider supplies. Stak does not receive your Google or Apple password.
• Learning activity: Stak stores lesson answers and completions, practice results, progress, XP, streaks, gems, and settings needed to run and sync the app.
• Social features: If you use a public handle, friends, or leagues, Stak stores the information needed to display those features and their standings.
• Device and service data: Stak uses session identifiers and network information such as IP addresses to keep accounts working and limit abuse.
• Optional test-build reports: In a test build, submitting a bug report sends the note and screenshot you choose to submit. Voice dictation turns speech into text on your device; Stak does not store an audio recording for the report.

How Stak uses information

Stak uses this information to authenticate accounts, save and sync progress, run learning and social features, prevent abuse, and respond to support or bug reports.

Service providers

Google or Apple handles the sign-in you choose. Stak stores app data on its server and uses infrastructure providers to operate that service. Stak does not sell account or learning data.

Keeping and deleting data

You can delete your Stak account from My stack → Settings → Account in the app. Deletion removes the account profile, linked sign-ins, and associated progress from the active service. Copies in routine backups may remain until those backups expire. You can also contact us if you need help with an account or data request.

Changes and contact

We may update this policy as Stak changes and will post the new version here with a new date. For privacy questions, contact lucas02.song@gmail.com.