In most cases, the contacts are not duplicates
For example, you have a contact entry saved in both the local phone memory and your iCloud account, CopyTrans Contacts will list both entries next to each other. These entries are not duplicates but simply exist in more than one account.
The above screenshot shows the same contact is listed three times in CopyTrans Contacts which means it exists in three locations. For instance, contacts marked with a gray star are sourced from Exchange. Contacts marked with a cloud icon are sourced from iCloud. Contacts that appear without an icon to the right are those saved locally on your iPhone. And so forth.
You can also see what accounts your iPhone contacts are sourced from by navigating to your iPhone screen, opening the Contacts app and tapping on “Groups” on the top left:
View contacts from a single account only
CopyTrans Contacts allows you to filter and display contacts from selected accounts only. Simply click on the Funnel button on top of the contact list and choose “Filter” and select an account to be displayed:
Now only the contacts from the chosen account will show up in CopyTrans Contacts: