It does what it’s supposed to but could be much better

Contacts Cleaner finds dupes and gives you options to delete or merge duplicates, however you cannot see the duplicates side by side to choose WHICH of them you want to keep. You cannot select what fields you want to merge and how. You cannot choose to bypass certain contacts so that the next time you open Contact Cleaner again, you have to pass those contacts again before getting to duplicates further down the list. If this program were a little more robust (even as robust as Contacts ITSELF is when importing VCARD archives that have duplicates), it would be worthy of 5 stars.

Electronicalover about Contacts Cleaner