Privacy Policy

Last updated: April 6, 2026

Introduction

Zenzu ("we", "our", "us") is committed to protecting your privacy. This Privacy Policy explains how we collect, use, and safeguard your information when you use our language learning application and website (zenzu.app).

Information We Collect

Account Information

When you sign up, we collect your email address and display name through Google Sign-In. We do not store your Google password.

Learning Data

We store your flashcard decks, vocabulary progress, course completion scores, podcast listening positions, and video watch history. This data is essential for providing personalized learning experience and spaced repetition scheduling.

Usage Analytics

We collect anonymized error reports and crash data to improve app stability. This includes device type, operating system version, and error details. We do not track browsing behavior or sell data to advertisers.

Audio & TTS

When you use text-to-speech features, the text is sent to a cloud provider for audio generation. Generated audio is cached on our servers for performance. We do not use your audio requests for training purposes.

How We Use Your Information

• Provide and improve the language learning service
• Schedule spaced repetition reviews at optimal intervals
• Generate personalized AI course content
• Cache TTS audio for faster playback
• Diagnose and fix technical issues (crash reports)

Data Storage & Security

Your data is stored in a secure cloud database with row-level security policies. Each user can only access their own data. All communication is encrypted via HTTPS/TLS. We do not sell, share, or rent your personal information to third parties.

Third-Party Services

We use trusted third-party services to provide core functionality:

• Cloud database and user authentication
• Social sign-in providers (Google)
• Error monitoring and crash reporting
• AI-powered transcription, translation, and content generation
• Text-to-speech audio synthesis
• Image generation for visual content
• Cloud hosting and content delivery

These services process data only as necessary to provide their functionality. We do not share your personal data with these services beyond what is required for the Service to operate.

Data Retention

Your data is retained as long as your account is active. You can delete your account and all associated data at any time by contacting us at [email protected].

Children's Privacy

Zenzu is not directed to children under 13. We do not knowingly collect personal information from children under 13.

Your Rights

You have the right to:

• Access your personal data
• Request correction of inaccurate data
• Request deletion of your data
• Export your data in a portable format

Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of significant changes through the app or email.

Contact

For privacy-related questions, contact us at [email protected].