Last updated: August 12, 2026
Simple Calendar is provided by Core-B.
This Privacy Policy explains how information is stored, collected, used, shared, retained, and protected when you use Simple Calendar.
Simple Calendar does not require an account and does not allow users to create or sign in to an account.
The following information may be stored locally on your device:
This locally stored information is used only to provide and configure Simple Calendar’s functionality.
Core-B does not receive or store these settings on its own servers.
You can remove locally stored information by clearing Simple Calendar’s app data in Android settings or by uninstalling the app.
Simple Calendar may request permission to access calendars on your Android device.
When permission is granted, Simple Calendar may read information from calendars selected by the user, including information such as:
Calendar information is used to display your schedule in the phone app and on the Simple Calendar watch face.
Core-B does not receive, upload, or store your calendar information on its own servers.
Simple Calendar can synchronize calendar information and app settings between your Android phone and a paired Wear OS watch.
This synchronization uses the Wear OS Data Layer provided by Google Play services.
Depending on the connection between the phone and watch, data may be transferred directly between the devices or may be routed through Google-operated infrastructure.
Core-B does not operate a server that receives or stores your synchronized calendar information.
Simple Calendar includes an optional Automatic theme that switches between Light and Dark based on local sunrise and sunset.
When Automatic is selected, Simple Calendar may request Android’s approximate location permission.
The location is used only to determine local sunrise and sunset times.
Simple Calendar does not require precise location for this feature.
Approximate location information used by Simple Calendar is not sent to or stored by Core-B.
If the user switches from Automatic to a manually selected Light or Dark theme, location information stored by Simple Calendar for this feature may be removed.
Simple Calendar uses the Google Mobile Ads SDK, commonly known as Google AdMob, to display advertisements.
When advertisements are loaded or displayed, Google and its advertising partners may automatically collect and share information such as:
The device’s IP address may be processed and used to estimate the general or approximate location of the device.
This advertising-related approximate location is separate from the Android approximate location permission used by Simple Calendar for sunrise and sunset calculations.
Information about interactions with the app and advertisements may be processed, including:
Information relating to the performance of the app or advertising SDK may be processed, including:
Google may process identifiers such as:
Google and its advertising partners may collect and share advertising-related information for purposes including:
Advertising may be personalized or non-personalized depending on the user’s consent choices, device settings, location, and applicable law.
Core-B does not use calendar events, calendar titles, event locations, selected calendars, or sunrise/sunset location information to personalize advertisements.
Where required by applicable law, Simple Calendar uses Google’s consent platform to request advertising and privacy choices before requesting advertisements.
Users may be able to change or withdraw applicable consent choices through the privacy options provided within the app.
Google processes advertising-related information according to its own terms and privacy policies:
Core-B does not operate a server or database that receives users’ calendar information, selected calendars, or locally stored Simple Calendar settings.
Calendar information and settings may be synchronized with the user’s paired Wear OS device through Google Play services as described above.
Advertising-related information may be collected and shared with Google and Google’s advertising partners.
Core-B does not directly sell users’ calendar information or locally stored app information.
Calendar information and Simple Calendar preferences are primarily processed locally on the user’s devices.
Synchronization between the Android phone and Wear OS watch is handled by Google Play services.
Advertising-related information collected by the Google Mobile Ads SDK is encrypted during transmission.
No method of electronic storage or transmission can be guaranteed to be completely secure.
Locally stored Simple Calendar settings and information remain on the device until one of the following occurs:
Core-B cannot remotely access or delete this locally stored information because it is not stored on Core-B’s servers.
Calendar information is obtained from calendars available through Android and remains controlled by the calendar provider and the user.
Removing a calendar, changing calendar permissions, clearing Simple Calendar’s data, or uninstalling the app prevents Simple Calendar from continuing to access locally cached or newly retrieved calendar information as applicable.
Advertising-related information is retained and deleted according to Google’s applicable retention policies, privacy policies, consent choices, and legal obligations.
Core-B does not directly control Google’s retention periods.
Users may be able to manage advertising personalization and reset or delete their Android advertising identifier through their Google account or Android device settings.
Simple Calendar does not provide user accounts or login functionality.
Simple Calendar does not collect:
Simple Calendar is not specifically designed or marketed for children.
Core-B does not knowingly collect personal information directly from children.
If you believe that a child has provided personal information in connection with Simple Calendar, contact Core-B using the address below.
Simple Calendar relies on certain Google services, including Google Play services, Wear OS Data Layer functionality, and Google Mobile Ads.
Advertisements or links displayed through Simple Calendar may open third-party websites, apps, or services.
Core-B does not control the content, security, or privacy practices of third parties. Users should review the privacy policies of those third parties before providing information to them.
This Privacy Policy may be updated when:
The latest version will remain available on this page. The “Last updated” date at the top indicates when the policy was most recently changed.
Simple Calendar is provided by:
Core-B
For questions, privacy inquiries, or concerns regarding this Privacy Policy, contact: