Privacy Policy

1. Introduction

Kotobridge ("the Service") respects your privacy and is committed to protecting your personal information. This Privacy Policy explains what information we collect, how we use it, and your rights.

2. Information We Collect

We collect the following information:

- Email address: Used for authentication through Google or an emailed login link.
- Account profile: We may store the display name and profile image provided by Google.
- Payment information: Subscription payments are processed by Stripe. We do not directly store credit card numbers or payment details.
- Learning progress: We record lesson completion status and quiz results.
- Usage logs: We may collect access logs for service improvement.

3. How We Use Your Information

We use collected information for:

- Account authentication and management
- Processing paid subscriptions
- Saving and displaying learning progress
- Service improvement and quality enhancement
- Responding to inquiries

4. Third-Party Services

We use the following third-party services:

- Google: Google Sign-In
- Better Auth: Authentication through Google and emailed login links
- Emailit: Login-link email delivery
- Stripe: Payment processing
- Cloudflare: Hosting, CDN, and data storage
- Azure Cognitive Services: Speech synthesis

Please refer to each service's official website for their privacy policies.

5. Cookies

We use cookies or similar technologies to maintain authentication sessions and save learning progress. Only when you allow measurement do we enable Google Analytics 4 (GA4) usage analytics and Google Ads purchase-count measurement. We do not personalize advertising. Your choice is stored in a cookie for 180 days and can be changed at any time through Cookie settings in the footer. If you reject measurement, these Google tags are not loaded.

6. Google Sign-In

The Service provides Google Sign-In. For authentication, we may receive your Google account identifier, name, email address, and profile image. We do not request access to Google Drive, Gmail, Calendar, or similar services. Email sign-in uses a one-time login link delivered through Emailit.

7. Data Storage and Security

User data is stored in Cloudflare D1 database and protected with appropriate security measures. Payment information is processed in Stripe's secure environment. Personal data is retained for the duration of your account. Upon account deletion, all data is permanently removed within 30 days, except where retention is required by law.

8. Your Rights

You have the following rights:

- Access to your data
- Request correction or deletion of your data
- Delete your account

To exercise these rights, please use your account settings or contact us at privacy@kotobridge.org.

9. Changes to This Policy

This policy may be updated as needed. We will notify you of significant changes through the website.

10. Contact Us

For questions about this policy, please contact us through the website or at privacy@kotobridge.org.