Privacy Policy

App name: Zelda Vocabulary

1. Overview

This Privacy Policy explains what data we collect, how we use it, and how we protect it. Our app helps users learn English vocabulary using personalized study features and optional AI-powered learning analysis.

2. Data We Collect

2.1 Learning Data

We may collect and store learning-related data, including:

• Learned topics
• Vocabulary progress
• Study history
• Lesson completion status
• Study streak information

2.2 Analytics Data

We may collect anonymized usage analytics to improve app performance and stability via Google Analytics, such as:

• Device model
• Operating system version
• App usage (screens viewed, session duration)
• Crash or performance diagnostics (if enabled)

3. How We Use the Data

Your data is used solely to provide and improve the app’s learning features, including:

• Providing learning history
• Tracking progress and study streaks
• Syncing learning data across devices (if you use cloud sync / an account)
• Generating personalized AI learning analysis and improvement suggestions (optional)
• Improving app stability, performance, and user experience

4. AI Processing (Optional Feature)

To provide personalized learning insights, the app may use a third-party AI service. AI processing is performed only after you give explicit permission.

4.1 What data is sent for AI processing

If you enable AI learning analysis, the app may send only the following learning content for processing:

• Learned topics
• Vocabulary progress
• Study history

4.2 Who receives the data

The AI processing is performed by: OpenAI

4.3 Permission and control

• We request your consent before sending any data for AI processing.
• You can disable AI learning analysis at any time in the app Settings.
• If you do not consent, the app will continue to work normally; only AI insights will be unavailable.

4.4 Data we do NOT send

We do not send personally identifiable information to the AI service, such as: name, email address, account ID, or device identifier.

5. Data Sharing

We do not:

• Sell your data
• Use your data for advertising
• Share your data with third parties for marketing purposes

We may share limited data with service providers only to operate the app:

• Analytics provider: Google Analytics (for anonymized usage analytics)
• AI service provider: OpenAI (only if you consent to AI learning analysis)

We require service providers to maintain protections that are equal to or greater than our own.

6. Data Storage and Security

• Learning data may be stored locally on your device and securely on our backend (if sync/account features are used).
• We use industry-standard security measures to protect data in transit and at rest.
• Access to data is limited to authorized systems and personnel as needed to operate the app.

7. Your Choices and Rights

You can:

• Disable AI learning analysis at any time in Settings
• Request deletion of your stored data (where applicable)
• Stop using cloud sync and keep learning data locally (if supported)

8. Children’s Privacy

We do not knowingly collect personal information from children. If you believe a child has provided personal data, please contact us to request deletion.

9. Changes to This Policy

We may update this Privacy Policy from time to time. We will post the updated version on this page and update the effective date above.

10. Contact

If you have any questions about this Privacy Policy, contact us at:
duy.nguyen.xb.apple@gmail.com