Calculus Master
Updated September 25, 2026 · Version 2.0 and later
Calculus Master (com.darreck.CalculusMasterr) is developed by Darreck (Doğukan Çetin). This policy describes the rebuilt Android app, version 2.0 and later.
The app does not collect or transmit personal information. It has no accounts, advertising, analytics, tracking, cloud synchronization, or Internet permission. Questions, mathematical rendering, and practice work offline.
Answers, learning progress, review reminders, the current practice session, and appearance and haptic preferences are stored only in the app’s private storage on your device. These records support your practice and are not sent to the developer or third parties. The app does not request access to your contacts, photos, camera, microphone, or location.
Local records remain on your device until you remove them. In version 2.1 and later, use Reset section progress on a section screen to remove that section’s progress, scheduled reviews and saved practice. To delete all local records, clear Calculus Master’s storage in Android Settings or uninstall the app. Clearing storage resets your learning progress. The app has no server copy or cloud backup from which the developer can restore it.
The app includes no advertising or analytics services. Google Play and Android may separately process information when you install or update apps, according to their own privacy policies and your device settings. Visiting the public policy page or emailing support uses your browser or email provider, outside this offline app.
The app does not collect personal information from users, including children.
For privacy questions, contact Darreck at d0guk4n@gmail.com. If you choose to email support, your email address and the information you provide are used to respond to your request. Please do not include sensitive information. Support messages are retained as needed to handle the request and meet applicable obligations; you can request deletion by contacting the same address.
If the app’s data practices change, this policy will be updated with a new revision date in the app and on its public privacy-policy page.