App: Contacts Cleanup
Developer: Aravindhan Parasuram
Genres: Utilities, Productivity

If you have hundreds or even thousands of contacts and you don't have the time to manually organize them and check for duplicates, then this app is for you. 

From this app you can backup the contacts too.

You can solve the below conflicts by using this app.
-Duplicate Contacts
-Duplicate Phones
-Duplicate Emails

-No Names
-No Phone
-No Email
-No Group
-No Picture

-Unusual Prefix
-Unusual Suffix

Release notes:
Fixed crash when the Merge All button is clicked in El Capitan.