Covve syncs two-way with your phone’s address book and will support contacts that come from all major contact accounts (Google Contacts, Exchange, iCloud, Outlook and Yahoo).
Covve will sync all basic data for your contacts such as: name, company, job title, country, phones and emails. Data that is not used in Covve (e.g. nicknames or birthdays) is not synchronized.
In general, Covve will synchronize with your address book every few seconds while you're on-line.