Bitrix24 calendars can be exported and viewed in third-party applications.
To get the export link, go to the Calendar section > click Calendars.
Click the hamburger button next to the calendar name > Export (iCal).
Copy the export link.
Go to the settings of the third-party application and paste this link. After connecting the Bitrix24 calendar to the third-party application, all existing events from your calendar will be exported to the third-party application.
Calendar export and calendar synchronization are different. New events created after export are not added to the third-party calendar.
Read more about calendar synchronization: