Kotoba Cross (日语九宫格) is provided by Kejitu (Hangzhou) Technology Co., Ltd. ("we", "our", or "us"). This Privacy Policy explains how we collect, use, store, and protect information when you use our mobile application and related services.
1. Information We Collect
1.1 Account and Authentication Information
Email address and account identifiers used for registration, login, and account recovery.
Third-party login identifiers from Apple, Google, QQ, or other supported providers.
Authentication records managed through Supabase Auth.
Basic app interaction data used to keep the service reliable and improve the learning experience.
1.3 Payment and Membership Data
Order IDs, product IDs, payment provider names, transaction status, and membership entitlement records.
For iOS purchases, Apple App Store purchase information needed for verification.
For Android or non-iOS purchases, Alipay or WeChat Pay notification data needed to verify payment status.
We do not collect full bank card numbers, card security codes, or payment account passwords.
1.4 Device and Diagnostic Information
Device type, operating system, app version, network status, and diagnostic logs needed for security, debugging, and abuse prevention.
2. How We Use Information
To provide login, account sync, learning progress, game levels, statistics, and membership unlocks.
To verify payments and prevent duplicate, fraudulent, or unauthorized transactions.
To maintain account security, troubleshoot issues, and improve app stability.
To respond to support requests and legal obligations.
We do not sell your personal information.
3. Third-Party Services
We may use the following providers only as needed to operate the app:
Supabase for authentication, database, and backend storage.
Apple, Google, and Tencent QQ for supported login methods.
Apple App Store, Alipay, and WeChat Pay for payment processing and transaction verification.
Cloudflare Pages for hosting this public legal page.
Each third-party provider processes data according to its own privacy policy and applicable law.
4. Data Storage and Security
We use technical and organizational safeguards designed to protect account data, learning records, and payment status.
Passwords are handled by authentication providers and are not stored by us in plain text.
Access to backend systems and payment secrets is restricted to authorized operational use.
5. Retention and Deletion
We retain account, learning, and membership data while your account remains active or as needed for legal, security, payment reconciliation, and anti-fraud purposes. You can request account deletion in the app or through the account deletion page below.
Depending on your jurisdiction, you may have the right to access, correct, delete, or request a copy of your personal information. To exercise these rights, contact us by email.
7. Children’s Privacy
The app is not directed to children under 13 or the minimum age required by local law. We do not knowingly collect personal information from children below the applicable minimum age.
8. International Processing
Your data may be processed and stored in regions outside your country or region. By using the app, you understand that such processing may occur where permitted by law.
9. Changes to This Policy
We may update this Privacy Policy from time to time. Updates will be posted on this page with a new effective date.