我是否需要一个 Google Workspace (G Suite) 帐户才能使用该应用程序，还是可以使用我的私人 Gmail 帐户？

No, a Google Workspace (G Suite) account is not required to use SharedContacts.com. You can sign up with an individual Gmail account if your team doesn’t have Google Workspace. However, the application is most effective in a business environment.