Privacy Policy
Last updated: September 6, 2026
1. Introduction
Welcome to Miraku ("we," "our," or "us"). We are committed to protecting your privacy and ensuring you have a positive experience on our platform. This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you use our Japanese learning application.
2. Information We Collect
2.1 Information You Provide
- Account Information: When you create an account, we collect your email address, username, and display name.
- Authentication Data: If you sign in using Facebook or Google, we receive basic profile information from these providers.
- Learning Progress: We store your study progress, including completed lessons, vocabulary learned, kanji mastered, and SRS (Spaced Repetition System) data.
- Mistakes and Performance: We track mistakes you make during quizzes and reviews to help improve your learning experience.
2.2 Automatically Collected Information
- Usage Data: We collect information about how you interact with our platform, including pages visited, features used, and time spent.
- Device Information: We may collect device type, operating system, browser type, and IP address.
- Cookies and Similar Technologies: We use cookies to maintain your session and remember your preferences.
3. How We Use Your Information
We use the information we collect to:
- Provide, maintain, and improve our services
- Personalize your learning experience and recommend content
- Track your progress and generate statistics
- Send you important updates about your account and our services
- Detect and prevent fraud or abuse
- Comply with legal obligations
4. Data Storage and Security
Your data is stored securely using Firebase, a Google Cloud Platform service. We implement appropriate technical and organizational measures to protect your personal information against unauthorized access, alteration, disclosure, or destruction.
However, no method of transmission over the Internet or electronic storage is 100% secure. While we strive to use commercially acceptable means to protect your data, we cannot guarantee absolute security.
5. Third-Party Services
We use the following third-party services:
- Firebase (Google): For authentication, database, and storage services
- Vercel: For hosting and content delivery
- Facebook/Google: For social authentication (only if you choose to use these services)
These services have their own privacy policies. We encourage you to review their privacy policies to understand how they handle your data.
6. Your Rights
You have the right to:
- Access: Request a copy of your personal data
- Correction: Update or correct inaccurate information
- Deletion: Request deletion of your account and associated data (see our Data Deletion Instructions)
- Portability: Export your learning progress data
- Opt-out: Unsubscribe from non-essential communications
7. Data Retention
We retain your personal information for as long as your account is active or as needed to provide our services. If you delete your account, we will delete or anonymize your personal data within 30 days, except where we are required to retain it for legal purposes.
8. Children's Privacy
Our services are not intended for children under 13 years of age. We do not knowingly collect personal information from children under 13. If you believe we have collected information from a child under 13, please contact us immediately.
9. Changes to This Privacy Policy
We may update this Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy on this page and updating the "Last updated" date. You are advised to review this Privacy Policy periodically for any changes.
10. Contact Us
If you have any questions about this Privacy Policy, please contact us at:
Email: privacy@miraku.jp
Website: Contact Page