Privacy Policy

Last updated: 2026-07-06

This Privacy Policy explains how 倉頡練習簿 (Cangjie Workbook), operated by Sophikos LLC. ("we", "us", or "the Service"), collects, uses, and protects your information when you use our Cangjie input-method learning application. We collect only what we need to run the Service, and we do not sell your personal information.

1. Information We Collect

  • Account information: the email address you register with, and a securely hashed password. If you sign in with Google, we receive your email address and basic profile identifier from Google instead of a password.
  • Learning data: your lesson progress, practice attempts, accuracy and speed statistics, favorites, and any custom texts you save. This powers your progress tracking, review scheduling, and analytics.
  • Payment information: when you subscribe, payment card details are collected and processed directly by our payment processor, Stripe. We do not receive or store your full card number, only limited billing metadata such as subscription status and invoice history.
  • Technical data: basic information such as your IP address and browser type, used for security, rate limiting, and diagnosing problems.

2. How We Use Your Information

  • To provide, maintain, and improve the Service and your learning experience.
  • To manage your account, subscription, and billing.
  • To send transactional email such as email verification and password-reset messages.
  • To protect the Service against abuse, fraud, and security threats.

3. Cookies and Local Storage

We use cookies and browser local storage to keep you signed in, remember your interface language, and store your learning progress on your device. These are necessary for the Service to function; we do not use advertising or third-party tracking cookies.

4. Third-Party Services

We rely on a small number of trusted providers to operate the Service:

  • Stripe: payment processing and subscription billing.
  • Google: optional sign-in via Google OAuth.
  • Brevo: delivery of verification and password-reset emails.

Each processes your data only as needed to provide its function and under its own privacy terms. We do not sell your personal information to anyone.

5. Data Retention

We keep your account and learning data for as long as your account is active. When you delete your account, we delete your associated personal data, except where we must retain limited records (for example, billing history) to comply with legal or accounting obligations.

6. Your Rights

You can access and update your information from your account settings, and delete your account at any time. Depending on where you live, you may have additional rights to access, correct, export, or erase your personal data. To exercise these rights, contact us at the address below.

7. Security

We use industry-standard measures, including password hashing, encrypted connections (HTTPS), and access controls, to protect your information. We work to protect your data and to respond promptly to any incident.

8. Children's Privacy

The Service is not directed to children under 13, and we do not knowingly collect personal information from them. If you believe a child has provided us personal data, please contact us so we can remove it.

9. Changes to This Policy

We may update this Privacy Policy from time to time. When we do, we will revise the "Last updated" date above and, where appropriate, notify you. Continued use of the Service after changes take effect means you accept the updated policy.

10. Contact Us

If you have questions about this Privacy Policy or your data, contact us at support@cangjieworkbook.com.