Privacy Policy

1. Overview

Riichi Score Trainer is committed to protecting your privacy. This policy explains how we handle information when you use our service. In short: we do not collect any personal information.

2. Information We Do Not Collect

Our service is designed with privacy in mind. We do not:

• Require account registration or login
• Collect personal information (name, email, etc.)
• Store your practice history on our servers
• Use tracking cookies for advertising purposes
• Sell or share any data with third parties

3. Local Storage

Your learning progress and preferences may be stored locally in your browser using standard web technologies (localStorage). This data never leaves your device and is not accessible to us. You can clear this data at any time through your browser settings.

4. Analytics

We use Google Analytics 4 (GA4) to understand general usage patterns and improve the service. Our GA4 implementation is configured with privacy-focused settings:

• Advertising features are disabled (no remarketing or ad personalization)
• Google Signals is disabled (no cross-device tracking)
• IP addresses are anonymized by default in GA4
• No user identification or login tracking

The analytics data collected includes:

• Page views and navigation patterns
• General usage metrics (problem generation, answer reveals)
• Browser and device type (aggregated)
• Geographic region (country level, not precise location)

You can opt out of Google Analytics by installing the Google Analytics Opt-out Browser Add-on.

5. Third-Party Services

Our service uses the following third-party services:

• Cloudflare Pages — Hosting and content delivery. See Cloudflare's Privacy Policy.
• Google Analytics 4 — Usage analytics (privacy-focused configuration). See Google's Privacy Policy.
• Sentry — Error monitoring to improve service reliability. See Sentry's Privacy Policy.

6. Children's Privacy

Our service does not knowingly collect any information from anyone, including children. The service is accessible to users of all ages without any data collection.

7. Changes to This Policy

We may update this privacy policy from time to time. Any changes will be posted on this page with an updated revision date. Continued use of the service after changes constitutes acceptance of the new policy.

8. Contact

For questions or concerns about this privacy policy, please contact us through the contact form.