Privacy policy
This policy covers the Underneath app (屏幕之下), this support website, and requests sent to our support email.
1. Data in the app
The app does not require an account or login. Completed-lesson records, your plain-language preference, your saved remix, and a cached course unlock status are stored on your device to resume lessons, revisit concepts, and show purchased access. The app does not upload your learning content to a developer server.
The app does not integrate advertising, third-party behavioral analytics, or cross-app tracking SDKs. It does not request access to contacts, location, the camera, or the microphone. Network activities in lessons use predefined data in a simulation.
2. App Store purchases
Full-course purchases and restoration use Apple StoreKit and the App Store. The app reads and verifies transactions and entitlements supplied by Apple on the device to unlock lessons and respond to refunds or revocations. Unlock status is cached locally. The developer does not receive your payment card details or Apple Account password through the app.
Apple separately processes purchase information and may provide developers with sales, refund, and aggregate reports. Read App Store & Privacy for Apple’s practices.
3. Contacting support
When you email us, we receive your email address, message, and any attachments or device details you choose to provide. We use them to respond, investigate problems, and handle privacy requests. Email providers process data needed to deliver and store messages.
Include only information relevant to your request. We retain support correspondence while handling the request and necessary follow-up. You may request access, correction, or deletion using the email below, subject to applicable legal retention requirements.
4. Support website
This website does not add advertising or behavioral analytics scripts, use browser local storage, or set its own tracking cookies. Hosting and network providers may process technical data such as IP addresses, browser information, and request logs to deliver pages, maintain security, and troubleshoot. Apple and email links are governed by the respective services’ policies.
5. Managing and deleting data
You can reset completed-lesson records in the app’s card deck. Deleting the app, rather than offloading it, removes its local data. Copies may remain in system backups, which are managed through your device and Apple settings. Deleting local data does not delete Apple’s purchase records; valid purchases can be restored after reinstalling.
We do not sell your personal information or use learning content for advertising. Email providers process support messages as needed. Relevant information may be disclosed when required by law.
6. Children and learning
The app does not ask learners to submit personal information or create an account. We encourage a parent or guardian to handle support emails for a child and to avoid including unnecessary personal details.
7. Changes and contact
When our data practices change, we will update this page and its effective date. Contact the Underneath maintainer with privacy questions or requests at [email protected].