Privacy Policy

Last updated: August 16, 2026 | Effective: March 7, 2026

Xiyue Intelligence Technology ("we", "us") takes your privacy seriously. This Privacy Policy applies to the Lynsee AI application and related services. Please read it carefully before using our services.

1. Information We Collect

We collect the following types of information to provide and improve our services:

Account information: phone number (for login verification), nickname, avatar (optional)
Video data: badminton match videos you actively upload, used for AI analysis
Analysis results: AI-generated analysis reports, scores, and statistics
Usage data: check-in records, achievement progress, and app preferences
Device information: device model, OS version, and app version (for compatibility and troubleshooting)
Profile information: the role you optionally select at sign-up (e.g. recreational player, coach, venue) and your intended use case. This is optional — skipping it does not affect any feature

2. How We Use Information

We use the collected information for the following purposes:

To provide AI badminton video analysis services
To generate personalized analysis reports and training suggestions
To maintain and improve app features
To provide technical support and customer service
To safeguard account security
To plan product features and improve our services based on profile information (used only for our internal product analysis and never shared with third parties)

3. Storage & Protection

Your account credentials (Token) are stored encrypted (Android EncryptedSharedPreferences / iOS Keychain)
Video data that needs uploading is transmitted to the server over HTTPS encryption; online auto-editing (clip.lynseeai.com) runs entirely in your browser — those videos are never uploaded to our servers
After analysis, the original video can be cleaned up automatically according to your settings
We apply industry-standard security measures to protect your data

4. Information Sharing

We do not sell or rent your personal information to third parties. We may share it only in the following cases:

With your explicit consent
As required by laws and regulations
To protect our legitimate rights (e.g., fraud prevention)

5. Third-Party SDKs

To enable certain features, the app integrates the following third-party services:

WeChat SDK (Tencent): for WeChat login (only enabled after an AppID is configured)
Syncfusion charting library: for data visualization (runs locally, transmits no data)

6. Your Rights

You have the right to:

Access and modify your personal information
Delete your account and all associated data
Withdraw your consent
Export your analysis data

7. Protection of Minors

We take the privacy of minors seriously. If you are under 14, please use this app and read this policy under the guidance of a legal guardian.

8. Policy Updates

We may update this policy from time to time. Material changes will be communicated via in-app notification or pop-up.

9. Contact Us

If you have any questions about this Privacy Policy, please contact us:

Email: luke@lynseeai.com
In-app feedback: Settings → Feedback