calsync mirror is a private, personal-use calendar synchronization application. It is operated by a single person for their own use and is not offered to the public: there are no other users and no way to sign up.
It copies the owner's own calendar entries one way, from the owner's Apple iCloud calendars into separate calendars that the application creates in the owner's own Google account, so the owner can view their schedule in Google Calendar. It never changes the original iCloud calendars.
Contact: mrkane7@outlook.com