Google will be able to block third-party apps from using the Google Calendar Provider API Obviously, giving third-party companies the ability to view your Calendar events can pose a security risk.

This update, as shared on Google Workspace Updates, will enable the Calendar API to differentiate events created from Gmail.

This new feature, found in Google Calendar's settings, aims to allow users to prevent third-party apps from viewing their Google Calendar events, even if those apps have general calendar access.

One Calendar is an API that wraps around commonly used calendars, such as Google Calendar and Microsoft Exchange, and was developed by the team behind the One Diary app.

Google just made the lives of third-party calendar developers much easier. Rather than having to constantly poll Google Calendar servers for updates, the Calendar API now supports push notifications.