Google Contacts

Google Contacts Pricing

Free with a Gmail account and from $6/user/month for a custom email
Features include
Keep track of contacts’ addresses, multiple emails and
phone numbers, birthdays, websites
Organize your contacts into groups
Note: Pricing information for Google Contacts is supplied by the software provider or retrieved from publicly accessible pricing materials. Final cost negotiations to purchase Google Contacts must be conducted with the vendor.

Google Contacts, the address book built into Gmail, lets you keep track of all your contacts, see when you last interacted with them, and more.