Google and Microsoft calendars, in any combination

Connect every account you work in. Each calendar gets Busy blocks for the others: the time, the word Busy and the name of the source calendar.

ProviderAccount typesStatusDetails
Google CalendarGoogle Workspace, GmailSupportedDetails
Microsoft 365 and OutlookMicrosoft 365, Outlook.comSupportedDetails
Apple iCloud CalendariCloudNot available yetDetails

Every pairing works

Blocks go both ways between all calendars in your sync group, whichever provider they belong to.

CalendarsTypical case
GoogleMicrosoftPersonal Gmail and an employer's Microsoft 365
MicrosoftMicrosoftTwo client tenants, or a client tenant and your own
GoogleGoogleTwo Google Workspace companies, or Workspace and Gmail

Need approval before you connect?

The security page lists each OAuth scope, what Caltsu stores and where. Send it to whoever approves apps in your organization, with the admin guide for your provider.

Read the security details