Contacts+ is described as 'The top contact management platform for professionals, teams and small businesses. Sync, deduplicate, enrich, & more. Effortlessly manage your address book contacts with Contacts+' and is a popular Contact Manager in the office & productivity category. There are more than 50 alternatives to Contacts+ for a variety of platforms, including Web-based, Windows, iPhone, Mac and Android apps. The best Contacts+ alternative is Google Contacts, which is free. Other great apps like Contacts+ are fruux, Memotoo, Kontact and Connect You.
Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
fruux is a free service that takes care of your contacts, calendars and more so you don't have to. Never manually copy contacts and calenders between your devices again!
With Memotoo, sync all you want !
Sync and share your personal datas (bookmarks, address book, calendar, files, ...) with Memotoo.com to find them from any computer connected to Internet.
Contacts, called Address Book before OS X Mountain Lion, is a computerized address book included with Apple Inc.'s macOS.
From my Mac I could manage all of my address book from Gmail and iOS.
Find the right people. All-to-one AI platform to mine data from across the Internet in real time and turn into sales.
BusyContacts makes managing contacts faster and more efficient. Offering the same power and flexibility that BusyCal users enjoy with their calendars, BusyContacts integrates seamlessly with BusyCal to form a flexible, easy to use CRM solution for managing calendars and contacts
Syncs contact between various third-party services and helps to clean them up and merge data.
Simple and efficient lead contact management system with out of the box click to call, tracking, capture and management. A cloud CRM system for any business of any size.
People in Windows 10 puts all the ways you connect with all your friends, family, colleagues, and acquaintances in one place, so it’s faster than ever to keep in touch.
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Google Contacts does not allow synchronization of contacts and their data across multiple email services, just Google's own Gmail