Privacy Policy

Last Updated: January 24, 2026

1. Introduction

Welcome to Avena ("we," "our," or "us"). This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you use our HSK Exam Prep mobile application and website (collectively, the "Service").

By using the Service, you agree to the collection and use of information in accordance with this Privacy Policy.

2. Information We Collect

2.1 Information You Provide

• Account Information: When you create an account, we collect your email address, display name, and profile picture (if you sign in with Google).
• Learning Data: Your study progress, quiz results, flashcard reviews, and HSK level preferences.
• User Preferences: Settings such as daily goals, reminder times, sound preferences, and display options.

2.2 Information Collected Automatically

• Usage Data: Pages visited, features used, session duration, and interaction patterns.
• Device Information: Device type, operating system, browser type, and screen resolution.
• Analytics Data: We use Google Analytics to understand how users interact with our Service.

3. How We Use Your Information

We use the information we collect to:

• Provide, maintain, and improve our Service
• Personalize your learning experience using our spaced repetition algorithm
• Track your progress and provide statistics
• Send you notifications and reminders (if enabled)
• Respond to your inquiries and support requests
• Analyze usage patterns to improve our products
• Detect and prevent fraud or abuse

4. Data Storage and Security

Your data is stored securely using Google Firebase, which provides enterprise-grade security including:

• Encryption in transit (TLS) and at rest
• Regular security audits and compliance certifications
• Secure authentication via Firebase Authentication

We retain your learning data for as long as your account is active. You may request deletion of your account and associated data at any time.

5. Data Sharing

We do not sell, trade, or rent your personal information to third parties. We may share data only in the following circumstances:

• Service Providers: With trusted third-party services (Google Firebase, Google Analytics) that help us operate our Service.
• Legal Requirements: When required by law or to protect our rights, safety, or property.
• Business Transfers: In connection with a merger, acquisition, or sale of assets.

6. Your Rights

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

• Access: Request a copy of your personal data.
• Correction: Request correction of inaccurate data.
• Deletion: Request deletion of your account and data.
• Data Portability: Request your data in a portable format.
• Opt-Out: Disable analytics tracking in app settings.

To exercise these rights, contact us at privacy@avena.app.

7. Children's Privacy

Our Service is not directed to children under 13. We do not knowingly collect personal information from children under 13. If you believe we have collected such information, please contact us immediately.

8. International Data Transfers

Your information may be transferred to and processed in countries other than your own. We ensure appropriate safeguards are in place to protect your data in accordance with this Privacy Policy.

9. Changes to This Policy

We may update this 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.

10. Contact Us

If you have any questions about this Privacy Policy, please contact us:

• Email: privacy@avena.app
• Website: https://goavena.com