Privacy Policy for HSK Learning App

Last updated: December 6, 2025

Introduction

HSK App ("we", "our", or "us") is committed to protecting your privacy. This Privacy Policy explains how we collect, use, and protect information when you use our mobile application.

Information We Collect

Analytics Data (Anonymous)

We use Firebase Analytics to understand how users interact with the app and improve the learning experience. This data is completely anonymous and includes:

• App Usage: Which screens you visit, which HSK levels you study
• Learning Patterns: Quiz completion rates, study session duration
• Language Preferences: Which translation language you use (English, Indonesian, Japanese, Korean, Vietnamese)
• Feature Usage: Audio playback, flashcard views, quiz attempts
• Device Information: Device type, OS version, app version (no device identifiers)

What We DON'T Collect

• ❌ Your name, email, or contact information
• ❌ Precise location data
• ❌ Device identifiers (IMEI, MAC address, etc.)
• ❌ IP addresses
• ❌ Personal vocabulary or quiz answers
• ❌ Any personally identifiable information (PII)

How We Use Analytics Data

The anonymous analytics data helps us:

• Understand which HSK levels are most popular
• Improve quiz difficulty and content
• Optimize the user interface and experience
• Identify and fix bugs
• Decide which translation languages to prioritize
• Measure app performance and stability

Local Data Storage

The app stores vocabulary data and your learning progress locally on your device using Android's Room database. This data:

• Remains on your device only
• Is not accessible to us or any third parties
• Can be deleted by uninstalling the app
• Is not backed up to cloud services by the app

Third-Party Services

We use the following third-party service:

Firebase Analytics (Google)

Firebase Analytics is provided by Google LLC. It helps us understand app usage through anonymous data collection. Firebase Analytics:

• Collects anonymous usage data
• Does not collect personally identifiable information
• Complies with GDPR and other privacy regulations
• Stores data securely on Google's servers

Learn more: Firebase Privacy Policy

Data Retention

Anonymous analytics data is automatically deleted by Firebase after 2 months. You can also request deletion of your data at any time by contacting us.

Data Security

We take data security seriously:

• All analytics data is transmitted over secure HTTPS connections
• Data is stored on Google's secure Firebase servers
• No personally identifiable information is collected or stored
• Local app data is protected by Android's security features

Children's Privacy

Our app is safe for users of all ages. We do not knowingly collect personal information from children under 13. Since we only collect anonymous analytics data and no PII, there are minimal privacy concerns for children using the app.

Parents can disable analytics in the app settings to prevent any data collection.

International Data Transfers

Analytics data may be processed on servers located outside your country, including in the United States where Google's Firebase servers are located. By using the app, you consent to this transfer. All data transfers comply with applicable privacy laws.

Your Privacy Rights

Depending on your location, you may have the following rights:

• Access: Request information about data we collect
• Deletion: Request deletion of your analytics data
• Opt-Out: Disable analytics collection in app settings
• Portability: Request a copy of your data (though we collect minimal anonymous data)

To exercise these rights, contact us at the email below.

GDPR Compliance (EU Users)

For users in the European Union, we comply with the General Data Protection Regulation (GDPR):

• We collect data based on legitimate interest (app improvement)
• You can opt-out of analytics at any time
• Data is anonymized and cannot identify you personally
• You have the right to access, delete, or port your data

CCPA Compliance (California Users)

For California residents, under the California Consumer Privacy Act (CCPA):

• We do not sell your personal information
• We collect only anonymous analytics data
• You can opt-out of data collection in app settings
• You can request deletion of your data

Changes to This Privacy Policy

We may update this Privacy Policy from time to time. Any changes will be posted on this page, and the "Last updated" date will be revised accordingly. Significant changes will be notified through the app.