Privacy Policy for Kotoba Sensei

Last Updated: November 5, 2025

This Privacy Policy describes how your personal information is collected, used, and stored when you use Kotoba Sensei.

1. Information We Collect

• Account Information: When you sign up, we collect basic information provided through Firebase Authentication, such as your email address and name.
• User-Generated Content: We store the Japanese text you input, your generated furigana results, and translations in your personal account history to provide our services. This data is linked to your user ID and is not accessible by other users.
• Payment Information: We do not store your credit card details. All payments are processed by our secure payment processor, Stripe. We only store a reference to your subscription and customer ID to manage your premium status.

2. How We Use Your Information

• To provide and maintain our service, including authenticating you, processing payments, and displaying your history.
• To communicate with you about your account or updates to our service.
• To monitor usage and improve the application.

3. Data Storage and Security

Your data is stored securely using Google Cloud Firestore. We take reasonable measures to protect your information, but no method of transmission over the Internet is 100% secure.

4. Sharing Your Information

We do not sell, trade, or otherwise transfer your personally identifiable information to outside parties. Your text inputs are processed by Google's AI models to provide the furigana and translation services.

5. 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 policy on this page.

6. Contact Us

If you have any questions about this Privacy Policy, please contact us at support@kotobasensei.com.