Privacy Policy

Last updated: September 4, 2026

At Cédric Fonsat (EI) ("we", "us", "our"), publisher of the WaterDuo mobile application ("the App"), we are committed to protecting your privacy. This Privacy Policy outlines how we collect, use, and safeguard your personal information when you use our mobile application and online services.

1. Information Collected

  • Identifiers: Unique User ID required for app functionality and cloud syncing.
  • Profile Information: Username/name and email address used for secure authentication and profile customization.
  • Hydration & Activity Data: Water intake logs and daily hydration goals, synced to allow you to track your progress and share it with friends.
  • In-App Purchases: Subscription status (Premium) securely managed through the Apple App Store.

2. Data Usage

We use your information to:

  • Ensure proper functioning of the application and sync your hydration data across devices.
  • Power social features (viewing your friends' hydration progress and sending friendly reminders).
  • Manage your Premium features and subscriptions.
  • Continuously improve performance, usability, and app stability.

3. Data Sharing

We never sell or rent your personal data to third parties for commercial or advertising purposes. Your data is shared only with strictly selected technical partners:

  • Supabase: Secure cloud database and authentication management (GDPR-compliant hosting in the European Union).
  • Apple App Store: Secure handling of in-app payments and subscriptions.

4. Your Rights (GDPR)

In accordance with the General Data Protection Regulation (GDPR), you hold the following rights regarding your personal data:

  • Right to access and rectification: You can consult and update your personal information directly within the app.
  • Right to erasure ("Right to be forgotten"): You can request the complete and permanent deletion of your account and all associated data at any time directly in the app settings via the "Delete my account" button, or by email.
  • Right to object to and restrict processing.

5. Contact

For any questions, information requests, or to exercise your rights, you can reach out to us at: hello@waterduo.app.