Privacy Policy

Last updated: February 23, 2026

Kusuridoki ("we", "our", "the app") is a medication management application. We are committed to protecting your privacy and handling your data responsibly.

1. Information We Collect

We collect the following types of information:

• Account information: When you sign in with Apple or Google, we receive your name and email address (or Apple's private relay email). Anonymous sign-in collects no personal information.
• Medication data: Medication names, dosages, schedules, and adherence records you enter.
• Photos: Optional pill photos you take, stored locally with AES-256 encryption.
• Caregiver links: Connection data between patients and caregivers.
• Device information: Timezone, language preference, and push notification tokens for delivering reminders.

2. How We Use Your Information

• Deliver medication reminders and track adherence
• Sync your data across devices via Firebase Cloud Firestore
• Enable caregiver monitoring (only with your explicit consent)
• Generate adherence reports (PDF)
• Display personalized ads via Google AdMob (free tier)

3. Data Storage and Security

• Local data is encrypted using Hive with AES encryption
• Pill photos are encrypted with AES-256 before storage
• Cloud data is stored in Firebase (Google Cloud) with user-scoped security rules
• Firebase Storage files are protected by per-user access rules
• All network communication uses HTTPS

4. Data Sharing

We do not sell your personal data. Data is shared only in these cases:

• Caregivers: Medication status is shared with caregivers you explicitly link
• Google AdMob: Advertising identifiers for displaying ads (you can opt out via device settings)
• Firebase Analytics: Anonymized usage data for app improvement

5. Third-Party Services

The app uses the following third-party services:

• Firebase Authentication, Firestore, Cloud Functions, Cloud Messaging (Google)
• Google AdMob (advertising)
• Apple Sign-In (authentication)

Each service has its own privacy policy. Please refer to Google's Privacy Policy and Apple's Privacy Policy.

6. Your Rights

• Access: View all your data within the app
• Export: Generate PDF reports of your adherence data
• Deletion: Delete your account from Settings. This permanently removes all server-side data including subcollections, caregiver links, and authentication records
• Revoke caregiver access: Remove linked caregivers at any time from Settings

These rights comply with Japan's Act on the Protection of Personal Information (APPI) and the EU General Data Protection Regulation (GDPR).

7. Children's Privacy

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

8. Changes to This Policy

We may update this policy from time to time. Changes will be posted on this page with an updated date. Continued use of the app after changes constitutes acceptance.