All duplicate contacts are checked and you can choose the delete option to remove them (In FREE version you can only delete a maximum of 180 contacts at one time).
The algorithm used in Duplicates for WhatsApp(TM) insures that only the duplicates are selected and its original (master) is not selected and therefore not deleted. The algorithm also uses a unique color coding scheme so that the original (master) and its duplicates are marked in the same color, allowing you to easily identify the original along with its duplicates.
Apart from finding & deleting your WhatsApp(TM) duplicate contacts you can also do the following with this app:
* There is a dialer that allows you to make calls to contacts
* Do a text based search on all contacts
* Add new contacts
* Edit existing contacts
Note that with the FREE version you can ONLY DELETE 180 duplicate contacts at one time (you can view unlimited duplicate contacts). With the pro version there is no limit on number of contacts you can deleted at a time.
For more information please visit: http://www.dasmic.com