Privacy Policy for VietDetour

Last Updated: July 31, 2026

Introduction

VietDetour (Android package app.ondetour) is published and operated by Ngô Hải Văn, the developer identified on the application’s Google Play store listing (“we”, “our”, or “us”). We respect your privacy and are committed to protecting your personal data. This privacy policy explains how we collect, use, and safeguard your information when you use the VietDetour mobile application.

Information We Collect

Personal Information

• Account Information: Email address, name, profile picture
• Authentication Data: Login credentials, OAuth tokens (Google Sign-In)
• User-Generated Content: Trip plans, activities, expenses, photos, documents, comments

Location Data

• Check-in Data: Location coordinates when you check in at places
• Route Optimization: Location data for route planning (only when feature is used)

Media Access

• Photos: Access to camera and photo library for uploading trip photos, expense receipts, and profile pictures
• Camera: For taking photos of receipts, places, and trip moments

Usage Data

• App usage statistics
• Device information (model, OS version)
• Crash reports and performance data

How We Use Your Information

• Trip Management: Store and sync your trips, activities, and itineraries
• Collaboration: Share trip information with invited members
• Expense Tracking: Calculate and split bills among trip members
• Location Services: Provide check-in functionality and route optimization
• Notifications: Send updates about trip changes, member activities, and reminders
• Service Improvement: Analyze usage patterns to enhance app features

Data Storage and Security

• Local Storage: Data is stored locally on your device using encrypted storage
• Cloud Sync: Optional cloud synchronization for backup and multi-device access
• Encryption: All data transmission uses HTTPS/TLS encryption
• Authentication: Secure token-based authentication with auto-refresh

Data Sharing

We do NOT sell your personal data. We may share data only in these cases:

• Trip Members: Information you choose to share within a trip (activities, expenses, photos)
• Third-Party Services:
  • Google Maps API (for location and route services)
  • Weather services (for forecast data)
  • Cloud storage providers (if you enable sync)
• Legal Requirements: When required by law or to protect our rights

Your Rights

You have the right to:

• Access: Request a copy of your personal data
• Correction: Update or correct your information
• Deletion: Request deletion of your account and data
• Export: Download your data in a portable format
• Opt-Out: Disable location services, notifications, or cloud sync

Data Retention

• Active Accounts: Data retained while your account is active
• Deleted Accounts: Data permanently deleted within 30 days of account deletion
• Local Data: Remains on device until app is uninstalled

Children’s Privacy

VietDetour is not intended for users under 13 years of age. We do not knowingly collect data from children under 13.

Third-Party Services

Our app integrates with:

• Google Sign-In: For authentication (governed by Google’s Privacy Policy)
• Google Maps: For location services
• Weather APIs: For forecast information

Changes to This Policy

We may update this privacy policy periodically. We will notify you of significant changes through the app or via email.

Contact Us

For privacy-related questions or requests:

• App: VietDetour
• Android package: app.ondetour
• Developer and data controller: Ngô Hải Văn
• Email: van.nh120802@gmail.com

Permissions Explained

iOS Permissions

• Camera: To take photos of receipts, places, and trip moments
• Photo Library: To upload existing photos to trips and expenses
• Location Services: For check-in and route optimization features
• Notifications: To receive trip updates and reminders
• Network: To sync data and access online features

All permissions are requested only when needed and can be managed in iOS Settings.