Sikppang English ("Company") values the privacy of TopikIQ application ("App") users and complies with the Korean Personal Information Protection Act and other applicable laws. This policy explains what personal information we collect, how we use it, how long we retain it, and your rights.

1. Information We Collect

Required

• Account information: email address, user ID, password (stored encrypted)
• Learning activity: quiz answers, writing submissions, study progress, scores
• Device information: device identifier, OS version, app version, push token
• Payment-related: subscription plan, payment status, RevenueCat user ID (payment method details such as card numbers are processed by Apple/Google, not by us)

Optional

• Display name (nickname)
• Voice recordings (for speaking practice, processed on-device only)

2. How We Use Your Information

• Account registration, authentication, and management
• Providing and personalizing learning content
• Core features including AI writing grading and AI tutoring
• Subscription management and payment status verification
• Sending study reminders (push notifications)
• App stability monitoring and bug fixes
• Statistical analysis for service improvement (de-identified)

3. AI Services and Data Transmission

The App uses Anthropic's Claude API for AI writing grading and tutoring features.

Data sent to Claude API: Only learning text you input (essays, questions, etc.) is transmitted. Personally identifiable information such as email, password, or payment details is never sent.

Anthropic does not use API input data for model training and deletes it within 30 days of processing. See Anthropic's Privacy Policy for details.

4. Third-Party Services

We do not sell your personal information. We use the following third-party services to operate the App:

• Supabase: User account and learning data storage (Row Level Security enabled) — Privacy Policy
• RevenueCat: Subscription and in-app purchase management (PCI-DSS compliant) — Privacy Policy
• Anthropic (Claude): AI writing grading and tutoring — Privacy Policy
• Expo: Push notification delivery — Privacy Policy
• Sentry: Error monitoring and performance analytics — Privacy Policy

5. Data Retention and Deletion

• We retain information necessary to provide the service while your account is active.
• Upon account deletion request, all personal information is destroyed within 30 days, unless retention is required by law.
• Error logs are retained for up to 90 days and then automatically deleted.
• Transaction and payment records are retained for 5 years as required by the Korean E-Commerce Act.

6. Your Rights

You may exercise the following rights at any time:

• Request access to, correction of, or deletion of your personal information
• Request suspension of personal information processing
• Request account deletion (Settings > Delete Account in the app, or by email)

Send requests to lulu066666@gmail.com and we will process them within 7 days.

7. Data Security

• All data in transit is encrypted with TLS/SSL.
• Passwords are hashed before storage.
• Supabase Row Level Security (RLS) policies ensure users can only access their own data.

8. Children's Privacy

TopikIQ is not directed to children under the age of 13, and we do not knowingly collect personal information from children under 13. If we become aware that such information has been collected, we will delete it immediately.

9. Changes to This Policy

This policy may be updated due to changes in law or service. Material changes will be communicated through in-app notifications.

10. Contact Information