Privacy Policy

The app stores locally on your device:

• Fluid intake entries (amount, drink type, date)
• App settings (daily goal, notification preferences)

Optionally, with your consent:

• Apple HealthKit data (weight, physical activity, water intake)
• Data synchronization via iCloud (across your devices)
• Photos selected for the AI Cup Scanner feature, processed via Google's Gemini AI service through Firebase; see below
• Saved scan history photos, only when you choose to save a vessel

The app includes an optional AI-powered cup scanner that estimates the volume of a drinking vessel from a photo. When you use this feature:

• The selected photo is sent to Google's Gemini AI service via Firebase for analysis
• Hydro does not save the photo automatically or on our own servers
• If you tap Save vessel, the app stores a compressed local copy in scan history on that device only
• Scan history is not synced through iCloud, is excluded from backup, and can be deleted entry by entry or all at once
• Google may process the image in accordance with their Privacy Policy
• The feature requires camera or photo library access, depending on how you select the image
• Usage is limited to 15 scans per day

Your data is used to:

• Track daily fluid intake
• Calculate recommended hydration goals
• Display statistics and history
• Send local water drinking reminders
• Estimate cup volume via AI, only when you use the scanner

We do not sell your personal data. Data is sent to third-party services only when you choose optional features described here, such as AI cup scanning through Google/Firebase or iCloud sync through Apple.

If you enable Apple Health integration:

• We read: body weight, physical activity, water intake from other apps
• We write: your water intake to Apple Health

HealthKit data is not used for advertising or shared with third parties. HealthKit access can be revoked at any time in System Settings.

If you enable iCloud synchronization:

• Hydration data is stored in your private iCloud container
• Only you have access to this data
• Synchronization happens automatically across your Apple devices

In-app purchases are handled by the Apple App Store. We do not have access to your payment information. Transaction information is stored by Apple in accordance with their privacy policy.

Most data is stored locally on your device or in your private iCloud container. The optional AI cup scanner sends selected photos to Google/Firebase for analysis. Saved scan history photos stay local on this device, are compressed, are excluded from backup, and are not synced through iCloud.

You can delete data at any time:

• In the app: Settings → Clear today's data
• In AI Scanner: delete one saved scan or clear scan history
• By deleting the app from your device

For privacy-related questions, contact us at: contact@vinze.pl