StudyStreak Companion stores extension settings, login state, synced subjects, subject websites, timetable reminders, and recent focus summaries in browser extension storage.

If the user logs in, the extension syncs with the StudyStreak backend at https://chichi.hackclub.app. It may send subject data, subject website lists, timetable data, focus session minutes, and focus-quality summaries.

Focus-quality summaries may include the selected subject, focus score, focused seconds, distracted seconds, idle seconds, top distracted domain, and completion time.

While a focus session is running, the extension checks the active tab domain to classify time as focused or distracted. It does not collect page contents, typed text, passwords, or full browsing history.

StudyStreak does not sell user data. Cloud data is used only for account sync, leaderboard streaks, timetable reminders, subject website sync, and focus-quality tracking.

Users can use StudyStreak locally without cloud sync. For questions or data removal requests, contact the developer through https://github.com/Chi-ChunL/StudyStreak/issues.