Privacy
Yujie is intentionally conservative about data collection. This page explains what information exists, why it exists, and how it is used.
Yujie processes the information needed to operate the product, such as device and app configuration, match records, swing and heart-rate related results, export or sync status, and basic diagnostics used to investigate support issues.
This information is used to record badminton sessions, generate post-match review, show trend history, support CSV export and HealthKit sync, and respond to support requests you initiate.
Yujie does not sell your match data to third parties. If a system-level feature such as Apple Health sync is triggered by you, the relevant data may be shared with that platform as part of the requested action.
You can stop using the service, disable platform permissions, export your data, or contact support about privacy-related questions. Some deletion actions may also depend on Apple platform settings.