Privacy Policy - Duchenne | 100% Private Smile Training App

1. Introduction

Welcome to Duchenne ("we," "our," or "us"). We are committed to protecting your privacy. This Privacy Policy explains our approach to data and privacy when you use our mobile application (the "App").

Important: Duchenne does NOT collect or access your personal data. Your data is stored on your device and backed up to your personal Google account, which only you control.

2. Your Data Ownership

Duchenne is designed with privacy as a core principle. You own 100% of your data. We do NOT collect, access, or store any of your personal information, photos, or usage data on our servers.

Your data is stored on your device and automatically backed up to your personal Google account, which only you control. We never have access to your Google account or the data stored in it.

3. Data Storage and Backup

3.1 Camera and Photo Data

Our App requires access to your device's camera to capture photos for smile training purposes. All photos and related data are:

Processed entirely on your device - No photos are ever sent to our servers
Stored on your device and backed up to your personal Google account - Only you have access
Never shared with us or third parties - We have no access to your photos or Google account
Owned and controlled by you - You can manage your backups through your Google account settings

3.2 Training Progress and Statistics

Your training progress, achievements, and statistics are:

Stored on your device and backed up to your personal Google account
Never uploaded to our servers
Only accessible to you through the App and your Google account
Fully owned and controlled by you

3.3 Google Account Backup

To protect your data and training progress, the App uses Android's built-in backup service to automatically back up your data to your personal Google account. This means:

Your data is backed up to YOUR Google account - Not our servers
Only you have access - We cannot see or access your Google account or backed-up data
Seamless device transfers - Your progress automatically restores when you switch devices
You control the backup - Manage or disable backups through your Google account settings
Protected by Google's security - Your backup is secured by Google's infrastructure

The backup is handled entirely by Google's Android backup service. We never receive, access, or store your backed-up data.

3.4 No Email Collection

We do not collect email addresses or any contact information through the App. All app features work without requiring any personal information or account creation.

4. How Your Data is Used

Your data is stored on your device and backed up to your personal Google account. It is used exclusively by the App for:

Providing smile training functionality and real-time feedback
Tracking your personal progress and achievements
Displaying your statistics and training history
Managing daily challenges and streaks
Restoring your data when you switch devices or reinstall the app

We never receive, access, or analyze your data in any way. Your data belongs to you and stays in your control.

5. Data Security

Your data is protected by your device's built-in security measures and Google's secure backup infrastructure. Since we don't collect or store your data on our servers, there is no risk of:

Data breaches on our servers (we don't have servers storing your data)
Unauthorized access by us or third parties to your information
Accidental data exposure or leaks from our systems
Tracking or surveillance of your activity by us

Your data is secured by your device and your Google account's security. We recommend:

Using your device's security features (passcode, biometric authentication)
Keeping your Google account secure with a strong password and two-factor authentication
Regularly reviewing your Google account security settings

6. No Data Sharing

We do not share, sell, rent, or transfer your data to anyone - because we don't have access to it.

Your photos, progress, and all app data remain in your control - stored on your device and backed up to your personal Google account. Your data is never transmitted to us or any third parties.

7. Data Deletion

You have complete control over your data:

Delete individual photos: Remove any photo from within the App at any time
Clear all data: Use the App's settings to reset and clear all your data from your device
Manage Google backups: Control your backed-up data through your Google account settings
Uninstall the App: When you uninstall Duchenne, app data is removed from your device. Your backup remains in your Google account until you delete it

Since no data is stored on our servers, there is no need to contact us for data deletion requests. You control all your data through your device and Google account.

8. Your Privacy Rights and Data Ownership

Since we don't collect your data, you automatically have complete control and privacy:

Full Ownership: You own 100% of your data - stored on your device and your personal Google account
Complete Access: All your data is accessible to you within the App and your Google account
Instant Deletion: Delete any or all data at any time without contacting us
Backup Control: Manage your Google account backups independently
No Tracking: We cannot track your usage, progress, or activity
No Profiling: We don't build profiles or analyze your behavior
Data Portability: Your data automatically transfers with you when you switch devices

You have complete control over all your data directly from the App and your device settings.

9. Children's Privacy

Our App is not intended for children under the age of 13. We do not knowingly collect personal information from children under 13. If you are a parent or guardian and believe your child has provided us with personal information, please contact us, and we will delete such information from our systems.

10. Third-Party Services

10.1 Google Firebase Analytics

We use Google Firebase Analytics to collect anonymous usage statistics that help us improve the App. This includes:

User count: Total number of active users and app installations
Basic usage metrics: App opens, session duration, and feature usage
Technical information: Device type, OS version, and app version
Crash reports: Anonymous error logs to help us fix bugs

Important: Firebase Analytics does NOT collect, access, or transmit:

Your photos or camera data
Your training progress or statistics
Your personal information or Google account details
Any data stored on your device or in your Google account backup

All analytics data is anonymous and aggregated. We cannot identify individual users from this data. Firebase Analytics is used solely to understand how many people use the App and which features are most popular, helping us make improvements.

Google Privacy Policies:

You can learn more about how Google uses data from apps that use their services by visiting How Google uses information from sites or apps that use our services.

10.2 No Other Third-Party Services

Apart from Firebase Analytics for anonymous usage statistics, Duchenne does not use any other third-party advertising or tracking services. Your personal data, photos, and training progress remain completely private and are never shared with third parties.

11. Internet Access

The App uses internet permission for:

Google Account Backup: To back up your data to your personal Google account
Firebase Analytics: To send anonymous usage statistics (user count, app usage) to help us improve the App
Offline Functionality: All core features work offline - backups and analytics sync when you're connected
No Personal Data to Our Servers: Internet access is never used to send your photos, progress, or personal data to our servers

You can use the App offline, and your data will sync to your Google account backup when you reconnect to the internet.

12. Changes to This Privacy Policy

We may update our Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy on this page and updating the "Last updated" date. Any changes will maintain our commitment to not collecting your data.

13. Contact Us

If you have any questions or concerns regarding this Privacy Policy, please contact us at:

Email: [email protected]
Website: duchenneapp.com

14. Android-Specific Permissions

Our Android app requires the following permissions, all used exclusively for local functionality:

Camera: To capture photos for smile training analysis (photos are stored on your device and backed up to your Google account)
Storage: To save your training progress, photos, and achievements on your device
Internet: To back up your data to your personal Google account
Notifications: To send you local reminders for daily challenges (optional, generated on your device)

You can manage these permissions in your device settings at any time. Revoking permissions will disable related features but won't affect your existing data.

15. Summary

Your Privacy is Guaranteed:

✓ NO personal data collection - We don't collect your photos, progress, or personal information
✓ NO servers storing your data - Your data stays on your device and your personal Google account
✓ Anonymous analytics only - Firebase collects anonymous usage stats (user count, app usage) to help us improve
✓ NO third-party access to your data - Your photos and training data aren't shared with anyone
✓ YOU own your data - 100% control through your device and Google account
✓ Automatic backup - Your progress is safely backed up to your personal Google account

Duchenne is designed to respect your privacy completely. You own your data, and your smile training journey is yours alone.