Compound
Privacy Policy
Last updated: July 3, 2026
Compound is an English learning app. We help users import learning materials, mark words, phrases, grammar points and speaking expressions, and practice with listening, grammar, logic and speaking exercises.
This Privacy Policy explains what information we collect, how we use it, and the choices users have.
Information We Collect
Depending on how you use Compound, we may collect:
- Account information, such as email address and login identifiers.
- Learning content you create or import, including materials, notes, tags, favorites, marked words, phrases, grammar points and speaking expressions.
- Learning progress, such as practice history, review schedules, completed exercises, output counts and subscription status.
- Audio or speech-related data when you use speaking or transcription features, so the app can provide practice feedback.
- Device and diagnostic information, such as app version, crash logs, performance logs and notification settings.
How We Use Information
We use collected information to:
- Provide login, sync, subscription and core app functionality.
- Save your learning materials and practice progress across devices.
- Generate exercises and learning feedback based on your marked content.
- Improve reliability, performance and user experience.
- Send reminders or learning notifications when enabled by the user.
Third-Party Content
Compound may let users import or access third-party learning materials from services such as video, article or social platforms. Users are responsible for ensuring they have the rights to use the content they import. Compound does not claim ownership of third-party content.
Payments and Subscriptions
In-app subscriptions are processed by Apple. We may receive subscription status information from Apple to unlock paid features. We do not receive or store your full payment card information.
Data Sharing
We do not sell personal information. We may use trusted service providers to operate the app, host data, process payments, deliver notifications, analyze reliability, or provide AI-assisted learning features. These providers are used only to support Compound's app functionality.
Data Retention and Deletion
We keep account and learning data while your account is active or as needed to provide the service. You may contact us to request deletion of your account or personal data, subject to legal and operational requirements.
Security
We use reasonable technical and organizational measures to protect user data. However, no online service can guarantee absolute security.
Children
Compound is not intended for children under 13. If we learn that we have collected personal information from a child under 13 without appropriate consent, we will take steps to delete it.
Changes to This Policy
We may update this Privacy Policy from time to time. When we do, we will update the date at the top of this page.
Contact Us
If you have questions about this Privacy Policy or want to request data deletion, contact us at wyq1995dr@163.com.