Apps to Automatic Duplicate Merge

Soocial was a cloud-based synchronization service designed to keep your contacts consistent and up-to-date across various devices, applications, and platforms, including computers, phones, and web services.

Plaxo is a comprehensive online address book and contact management service designed to keep your contacts organized, synchronized, and up-to-date across various devices and platforms. It offers robust features for merging duplicates, integrating with popular services, and providing a unified view of your network.

Contacts is a fundamental contact management application designed for macOS, providing seamless integration within the Apple ecosystem for organizing and managing personal and professional connections.

fruux is a robust cross-platform synchronization service designed to keep your contacts, calendars, and tasks seamlessly in sync across all your devices and applications. It offers a secure and reliable cloud platform with strong privacy focus, ideal for individuals and teams needing consistent data access and collaboration.

Memotoo is a comprehensive online service designed to centralize and synchronize all your personal information, including contacts, calendars, tasks, notes, and bookmarks. It acts as a hub to connect various online services and devices, ensuring your data is consistent and accessible from anywhere.

Kontact is a comprehensive personal information management suite from KDE combining email, contacts, calendar, tasks, and news in one integrated application. It offers robust synchronization options and supports various protocols.

Google Contacts is a contact management tool integrated with your Google Account, providing a centralized and accessible platform to store, organize, and manage your contacts across all your devices.

FullContact is a comprehensive platform designed to help businesses and individuals manage, enrich, and unify their contact information. It goes beyond a simple address book, providing powerful tools for cleaning data, discovering professional details, and integrating with existing workflows to create a complete view of every contact.