CircleBack provides the email connection service for ContactCloud users. When you use the email connection service to get a free plan with ContactCloud, a CircleBack account is created for you with the same credentials.
You can download the CircleBack mobile app, and use your ContactCloud credentials to log-in. If you have changed your ContactCloud password, however, your password will not be the same on the CircleBack app. A password reset function is available, as needed.
You may also delete your CircleBack account or disconnect your email. However, disconnecting your email will put your free ContactCloud subscription on hold.