Privacy Policy

1. Information We Collect

Depending on how you use our services, we may collect the following types of information:

• Account Information: Your username, email address, and password (encrypted) provided during registration.
• Learning Data: Learning records generated when using various practice features, including scores, accuracy, time spent, and consecutive day streaks. This data is primarily stored in your browser's localStorage. When you log in, some data may be synchronized to our servers for cross-device access.
• Usage Data: Anonymized information automatically collected through Google Analytics, including pages visited, time spent, device type, browser type, and approximate geographic location. This data cannot be used to identify you personally.
• Communication Data: When you contact us via email, we receive your email address and communication content.

2. How We Use Information

The information we collect is used for the following purposes:

• To provide, maintain, and improve our learning services and features;
• To create and manage your user account;
• To record and track your learning progress, providing a personalized learning experience;
• To analyze website usage trends and user behavior to optimize the user experience;
• To respond to your inquiries, feedback, or support requests;
• To send important service-related notifications (such as password reset emails).

3. Local Storage and Data Synchronization

This website primarily uses browser localStorage to store your learning data and preferences, including: game session records (scores, duration, accuracy), wrong answer records, user profile (streaks, statistics), and authentication credentials. This data is stored only on your device by default. When you log in, some learning data may be uploaded to our servers for synchronization, allowing you to access your learning records across devices. You can clear localStorage data at any time through your browser settings, or use the export/clear data features on the Dashboard page.

4. Cookies and Similar Technologies

This website uses the following types of cookies and similar technologies: Essential Cookies (used for user authentication and session management to ensure proper website functionality) and Analytics Cookies (Google Analytics uses cookies to collect anonymous website usage statistics). You can manage or disable cookies through your browser settings, but please note this may affect the normal functioning of certain website features.

5. Third-Party Services

We use the following third-party services, which may collect and process data according to their respective privacy policies: Google Analytics (a web analytics service used to understand how users interact with our website. The information collected by Google Analytics is anonymous and does not contain personally identifiable information. You can opt out by installing the Google Analytics Opt-out Browser Add-on). Our backend API service is hosted on Cloudflare infrastructure, and Cloudflare may process network traffic data according to its privacy policy.

6. Data Security

We take reasonable technical and administrative measures to protect your personal information from unauthorized access, use, modification, or disclosure. User passwords are stored in encrypted form, and API communications are transmitted using HTTPS encryption. However, please note that no method of internet transmission or electronic storage is 100% secure, and we cannot guarantee absolute security.

7. Data Retention

We will retain your personal information for as long as necessary to fulfill the purposes for which it was collected, unless a longer retention period is required or permitted by law. Learning data stored in localStorage is managed by your browser and does not automatically expire. Account data will be retained until you actively delete your account.

8. Your Rights

Depending on applicable data protection laws, you may have the following rights:

• Right of Access: Obtain a copy of the personal information we hold about you;
• Right to Rectification: Request correction of inaccurate or incomplete personal information;
• Right to Erasure: Request deletion of your personal information (including account cancellation);
• Right to Data Portability: Receive your data in a structured, commonly used, and machine-readable format (this website already provides a data export feature on the Dashboard page).
• To exercise these rights, please contact us at [email protected].

9. Children's Privacy

This website is intended for a general audience and is not directed at children under the age of 13. We do not knowingly collect personal information from children under 13. If we become aware that we have inadvertently collected such information, we will take steps to delete it as soon as possible. If you believe your child has provided us with personal information, please contact us immediately.

10. Updates to the Privacy Policy

We may update this Privacy Policy from time to time. The updated Privacy Policy will be effective immediately upon posting on this page. For material changes, we may notify you through a website notice or email. We recommend that you periodically review this page for the latest version.

11. Contact Us

If you have any questions, comments, or complaints about this Privacy Policy or our data practices, please contact us at:

Email: [email protected]