Hydro — Water Reminder

Privacy Policy — Hydro

Effective date: September 22, 2026

Hydro (“the app”) is developed by VISION SYSTEMS CORP (“we”, “us”). This policy explains what data the app collects, why, and how you can control it.

Summary

• Your water intake, goal and body details stay on your device.
• We use Firebase for sign-in, crash reports and basic usage analytics.
• We do not show ads, and we do not sell or share your data for advertising.
• You can delete your account and data at any time, inside the app or by email.

Data we collect

Account data

When you create an account or sign in with Google, Firebase Authentication (Google LLC) processes your email address, name and, for Google accounts, your profile photo URL. We use this only to sign you in and to show your name and photo in the app.

Health and fitness data (stored on your device only)

The app stores the following locally on your device in an app-private database:

• water intake entries, daily goals, streaks and badges;
• gender, age, weight and activity level, used to calculate your daily goal;
• wake-up and bedtime, used to schedule reminders;
• an optional profile photo that you choose.

This data is not uploaded to our servers. If you enable Android device backup, Android may include it in your encrypted Google backup, which Google manages under its own privacy policy.

Crash reports

Firebase Crashlytics collects crash traces, device model, OS version and an installation identifier so that we can find and fix bugs.

Usage analytics

Google Analytics for Firebase collects anonymous app usage events (for example screen views and app opens), device information and an app instance identifier, to help us understand how the app is used and to improve it.

How we use data

We use data only to provide and improve the app: sign-in, reminders, statistics, fixing crashes and understanding feature usage. We do not use it for advertising or profiling, and we do not sell it.

Sharing

Data is shared only with the service providers listed above (Google Firebase), who process it on our behalf. We may disclose information if the law requires it.

Retention

• Account data is kept until you delete your account.
• On-device data stays on your device until you delete your account, clear the app’s data or uninstall the app.
• Crash and analytics data is kept according to Firebase retention settings and then deleted automatically.

Your choices and rights

• Delete your account: open Profile → Delete account in the app. This permanently deletes your Firebase account and all app data on the device. You can also request deletion by email; see Account deletion.
• Notifications: you can turn them off in the app or in Android settings.
• You can ask us for access to, or correction of, your account data at any time.

Children

The app is not directed to children under 13, and we do not knowingly collect their personal data.

Security

Data travels over encrypted connections (HTTPS). On-device data is stored in app-private storage that other apps cannot read.

Changes

We may update this policy. We will post the new version on this page with a new effective date.

Contact

VISION SYSTEMS CORP — adilxankenesov11@gmail.com