Contact Optimizer is a third-party contact program that will enhance your default contact manager with automatic functions like eliminating duplicate contacts, removing invalid contacts, backing up, and more.
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Smart Contact Reminder help you stay in touch with friends, family, colleagues, customers, or business contacts regularly using reminders.
Cardhop is a clever take on contact management. It uses the same address book as the default Contacts app on your Mac, iPhone, and iPad. But it lets you search, add, and edit contacts much more efficiently.