Shuyue Privacy Policy
Last Updated: 2026-09-22
Shuyue Privacy Policy
Effective Date: September 22, 2026
Operator: Huanzhi Tech
Shuyue is a private, offline-first menstrual cycle tracking and personal wellness application crafted by Huanzhi Tech. Intimate health records represent your most sensitive information. Shuyue is engineered under strict offline-first principles: zero cloud sync, zero ad SDKs, and local sandbox isolation.
1. Data Processed (Local Sandbox Only)
Shuyue is an offline application. Your personal health records never leave your physical device.
- Local SQLite Storage: Your period logs, symptom entries, cycle predictions, and personal notes are stored strictly in a local SQLite database protected by operating system application sandboxing.
- Zero Account & Zero Cloud Leak: No registration or login required. We operate zero cloud servers for health database storage.
- No Commercial Ad Trackers: Shuyue integrates zero third-party advertising SDKs. Personal health data is strictly firewalled from marketing channels.
2. System Permissions
| Permission | Usage Timing | Purpose | Network Upload |
|---|---|---|---|
| Notifications | When you enable period or medication alerts | Dispatch on-device local notifications at configured times | No (On-device timer) |
Shuyue never requests camera, contacts, precise location, or microphone permissions.
3. On-Device Prediction Engine
The cycle prediction model V2 is a pure Dart local mathematical engine. Regularity estimates and date windows compute entirely on your device’s processor without sending requests over the internet.
4. Export & Permanent Data Purge
- Local Export: You may export your logs to human-readable backup files directly on your device.
- Permanent Purge: Tapping “Clear all records” in settings, clearing app storage in device settings, or uninstalling Shuyue will instantly and permanently erase the database from your device.
5. Contact Us
Website: https://huanzhitech.com
Contact Email: contact@huanzhitech.com