Privacy Policy

Last updated: September 4, 2025

This Privacy Policy explains how GG Diagram (the "App") handles personal information. By using this App, you agree to the collection and use of information in accordance with this policy.

1. Developer Information

This App is developed and operated by an individual developer.

2. Information We Collect

2.1 Sensor Data

• Accelerometer Data: Used to measure vehicle's longitudinal and lateral acceleration
• Gyroscope Data: Used to detect device orientation and rotation
• Location Data (GPS): Used for recording driving trajectories and map display

2.2 Audio Data

• Voice Recording: Audio is recorded and saved only when users use the recording feature
• Audio data is stored locally on the device and is not transmitted to external servers

2.3 App Usage Data

• Recording Sessions: Driving data, timestamps, duration
• Settings Information: User app settings (sensitivity adjustments, display settings, etc.)

3. How We Use Information

The collected information is used only for the following purposes:

• Real-time GG diagram display
• Recording and displaying driving trajectories
• Map display based on GPS location information
• Providing voice memo functionality
• Data export functionality (CSV, binary files)
• Displaying driving data statistics (speed, distance, acceleration, etc.)
• Improving app functionality and user experience

4. Permissions

This App requests the following permissions:

4.1 Required Permissions

• Sensor Access: Access to accelerometer and gyroscope
• Location: GPS functionality for location information
• Storage Access: Saving recorded data and importing/exporting files

4.2 Optional Permissions

• Microphone: Only when using voice recording feature
• Camera: For future feature expansion (not currently used)

5. Data Storage and Management

• All data is stored in local storage on the user's device
• Data is stored in unencrypted format but is not transmitted outside the device
• Users can delete data from within the app at any time
• Uninstalling the app will delete all data

6. Information Sharing with Third Parties

This App does not share personal information with third parties except in the following cases:

• When users explicitly choose to export or share data
• When legally required

7. Third-Party Services

This App uses the following third-party services:

• Apple App Store / Google Play Store: App distribution and in-app purchases
• Google Maps API: Map display functionality (location information may be sent to Google)
• Apple Maps: Map display functionality in iOS version

8. Premium Features and Billing

• This App has premium features billed through App Store/Google Play
• Billing information (purchase history, receipts, etc.) is managed by Apple/Google
• The developer does not directly collect personal information related to billing

9. Data Security

• Data is stored only on the user's device and is not transmitted externally
• Data is protected by the device's security settings (passcode, Touch ID, Face ID, etc.)
• App permissions are limited to the minimum necessary

10. Children's Privacy

This App does not intentionally collect personal information from children under 13. If we discover that a child under 13 has provided personal information, we will promptly delete it.

11. Changes to This Privacy Policy

This Privacy Policy may be updated as necessary. For significant changes, we will notify users through in-app notifications or update information.

12. International Data Transfer

While this App generally does not transmit data externally, data may cross borders in the following cases:

• When using Google Maps API (location information may be sent to Google's servers)
• When users explicitly share or export data

13. Your Rights

Users have the following rights:

• Right of Access: View stored data
• Right of Deletion: Request data deletion
• Right of Rectification: Request data correction
• Right of Portability: Export data

This Privacy Policy should be read in conjunction with the Terms of Service for the GG Diagram app.