Covve is designed to seamlessly sync 2 way with your entire phone’s address book, and will support contacts that come from all major contact accounts (Google Contacts, Exchange, iCloud, Outlook, and Yahoo).
Most data updated using Covve, is also automatically synced back to your phone's address book - so data added by Covve is yours to keep.
See here what data is synced back:
Note: Covve-specific data, such as 'Industry', reminders and activity notes, are not synced back to your address book as they cannot be matched to the native phone addressbook.
In most cases, Covve will instantly apply any changes you make in Covve to your phone's addressbook.
Changes made to your phone's address book will be applied into Covve each time you launch the Covve app unless this happens too often in which case syncing will happen every few launches.