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Privacy Policy

Last updated: January 14, 2026

Denkaiwa ("we", "our", or "us") is committed to protecting your privacy. This Privacy Policy explains how we collect, use, and safeguard your information when you use our mobile application.

Information We Collect

Account Information

When you create an account, we collect:

• Email address
• Password (encrypted)

Usage Data

We automatically collect information about how you use the app:

• Scenarios completed
• Progress and performance metrics
• Session duration
• Feature usage patterns

Voice Data

When you use speech recognition features:

• Voice recordings are processed in real-time for speech-to-text conversion
• We do NOT store your voice recordings on our servers
• Speech recognition is handled by your device's native speech services (Apple Speech or Google Speech)

How We Use Your Information

We use the information we collect to:

• Provide and maintain the app
• Track your learning progress
• Personalize your experience (scenario recommendations)
• Send important updates about the service
• Improve our app based on usage patterns
• Process payments (handled by Apple/Google)

Data Storage & Security

Your data is stored securely using industry-standard encryption. We use Supabase for our backend infrastructure, which provides:

• Encrypted data at rest and in transit
• Regular security audits
• SOC 2 Type II compliance

Third-Party Services

We use the following third-party services:

• Supabase - Database and authentication
• Apple App Store / Google Play - Payment processing
• Device Speech Services - Speech recognition (no data sent to our servers)

Your Rights

You have the right to:

• Access - Request a copy of your data
• Correction - Update inaccurate information
• Deletion - Request deletion of your account and data
• Export - Download your learning progress data

To exercise these rights, contact us at the email below.

Data Retention

We retain your data for as long as your account is active. If you delete your account:

• Personal data is deleted within 30 days
• Anonymized usage statistics may be retained for analytics

Children's Privacy

Our app is not intended for children under 13. We do not knowingly collect information from children under 13. If you believe we have collected such information, please contact us immediately.

Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of significant changes by:

• Posting the new policy in the app
• Sending an email notification
• Updating the "Last updated" date

Contact Us