Mac users interested in Address book duplicate cleaner generally download:
Even though Contacts, Mac's default address book app, comes with an integrated duplicate finder there's still a chance the app could fail to locate all contact copies (it comes with a small amount of search filters). For this reason, programs like AddressBook Cleaner were developed.
Additional suggestions for Address book duplicate cleaner by our robot:
Contacts Cleaner analyzes, reports, and fixes dozens of problems with Address Book and Apple Sync Services problems ranging from the obvious......
such as duplicated contacts ...Contacts Cleaner scans your Address Book
