Solution 1: via "Google Contacts"
Create a new sync.blue® connection to synchronize any contact source with the "Google Contacts" target (a personal Google account). Typically, your Google account is already linked to your Android smartphone, so it will automatically receive the contacts synchronized via sync.blue®.
Solution 2: via DAVx
This paid third-party Android app can synchronize contacts from the sync.blue® CardDAV server with your local Android contacts and is available through the Google Play Store.
DAVx is available as an app for individual users, but it can also be centrally managed for businesses (i.e., all employees can install and configure it).