How secure is my data and events in Year Glance?

Year Glance provides the connection and access token to your third party calendars. 

Year Glance stores the ID and name of your third party calendars but does not access or store any calendar event data.

In other words, we never know your availability, your events or any other calendar details.

Users can remove the access token and permission to third party calendars via Year Glance by logging out of a calendar, or the Google / Microsoft Outlook account and security pages.

Manage third-party apps & services with access to your account (Google)

https://support.google.com/accounts/answer/3466521?hl=en

Manage app permissions - revoke app (Microsoft)

https://docs.microsoft.com/en-us/cloud-app-security/manage-app-permissions#revoke-app-and-notify-user