Bellgrid Privacy Policy

Effective date: 2026-10-05

Bellgrid ("the app") is a class timetable provided by DDJ A1 ("we", "us"). It shows your weekly classes as a grid, tells you what class is on now and next, reminds you before each class, and keeps track of homework and exam deadlines. Bellgrid is deliberately designed as a local-only app: it has no account system, no login, no server, and no cloud storage operated by us.

Data stored on your device

Everything you enter — class names, days and times, rooms, teachers, colors, homework and exam titles, due dates, notes, and your app preferences — is stored only on your device and is never transmitted to us. There is no sign-up, account, or login. Deleting the app deletes all of this data from your device. Android's standard app backup may include this data in your own Google account backup if you have device backup enabled; that backup is controlled by you and Google, not by us.

Backup files, timetable images and the home screen widget

When you back up your timetable, the app writes a file only to the location you choose with the system file picker. Restoring reads only the file you select. When you share your timetable as an image, the app draws the image on your device and hands it only to the destination you pick in the system share sheet. The home screen widget reads the same data stored on your device. Those files and images are under your control; we never receive them.

Permissions the app asks for and why

• Notifications (POST_NOTIFICATIONS, optional). For reminders before a class starts and a short morning and evening summary. You can turn these off per class or in Settings. Notifications are scheduled and shown locally.
• Alarms & reminders (SCHEDULE_EXACT_ALARM, optional). Used only so that the reminder before a class rings on time. The app uses it only if you allow it in Settings; otherwise reminders may arrive a few minutes early or late.
• Run at startup (RECEIVE_BOOT_COMPLETED). Android discards scheduled reminders when the device restarts. The app listens for this event only to re-register your reminders.
• Vibration (VIBRATE). For reminders.
• Internet access (INTERNET, ACCESS_NETWORK_STATE) and the advertising identifier (AD_ID). Used only by the advertising components described below. No timetable feature of the app sends or receives data over the network.

The app does not request access to your location, contacts, calendar, camera, microphone, SMS, or the content of other apps.

Information collected automatically

When you use the app, certain information may be collected automatically by third-party SDKs used for advertising. This may include:

• Your device's Internet Protocol (IP) address, which may be used to estimate your approximate (general) location
• Device or other identifiers, such as your device's advertising identifier (Advertising ID) and app set ID
• App interactions, such as session time, screens viewed, and ad views and taps
• Crash logs and diagnostic information, such as the mobile operating system and device model you use and ad performance data

This information is collected by the advertising SDK and shared with Google (AdMob) and its advertising partners for advertising, analytics, and fraud prevention, security and compliance purposes. It is encrypted in transit. It is not linked by us to your timetable or tasks, which stay on your device.

Advertising

The app displays advertisements provided by Google AdMob. Full-screen ads are never shown while you are viewing your timetable or editing a class; they may appear only after you finish saving a class or task, or after you share your timetable image. To serve ads, AdMob and its partners may access your device's Advertising ID and the information described above. For users in the European Economic Area (EEA), the United Kingdom, and other regions where required, the app presents a consent form via Google's User Messaging Platform (UMP) before personalized advertising data is used; if you decline, non-personalized ads are shown instead. You can reset or limit ad personalization at any time in your device settings (Settings → Google → Ads), and you can change your consent choice from the app's Settings screen.

For more information on how Google uses data when you use partners' apps, see https://policies.google.com/technologies/partner-sites.

Children

The app is not directed to children under 13, and we do not knowingly collect personal information from children. The app displays ads configured through Google AdMob in accordance with Google's policies.

Your rights

Because your timetable and tasks exist only on your device, you are in direct control of them: you can view, correct, or delete them in the app at any time, and uninstalling the app removes them completely. Depending on your region (e.g. GDPR in the EEA/UK, CCPA in California), you may also have rights regarding data processed by advertising SDKs; you can exercise ad-related choices through the consent form and your device's ad settings described above.

Security

Your timetable stays on your device, which removes the most common exposure paths (server breaches, account leaks). We recommend protecting your device with a screen lock and keeping backup files somewhere only you can access.

Changes to this policy

We may update this policy from time to time. Changes will be posted on this page with an updated effective date. Continued use of the app after changes constitutes acceptance of the updated policy.

Contact

If you have any questions about privacy while using the app, or about this policy, contact us at bloodturtle@naver.com.