Can I use PieSync to clean my contacts too?
No, PieSync keeps your contacts in sync two-way and in real time. We use the email address as the identifier to determine if a contact needs to be matched and kept in sync between two applications.
PieSync will do everything it can in the back-end to avoid duplicates. Enabling the additional Avoid Duplicates functionality (only sync contacts with email), is an extra layer to protect you from duplicates.