The best open source alternative to Google Contacts is Fossify Contacts. If that doesn't suit you, our users have ranked more than 50 alternatives to Google Contacts and 16 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Google Contacts are DAVx5, Nextcloud Contacts, Right Contacts and fruux.
Introducing Fossify Contacts - the next evolution in contact management. Poised to redefine how you manage your contacts, our app combines simplicity with advanced features, tailored for both personal and professional use.
India
The Nextcloud contacts app is a user interface for Nextcloud's CardDAV server. Easily sync contacts from various devices with your Nextcloud and edit them online.
The ultimate app for organizing and customizing your contacts with a focus on privacy. Take control of your contact list by creating private contacts that are accessible only within the app, ensuring that your personal information remains confidential and secure.
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!
Germany
EU
GermanyEU
Manage contacts. Keep your contacts private and secured with OpenContacts independent and local database.
A contact management application with support for vCard file format (.vcf).
United States
It supports large variety of services, including NextCloud, Kolab, Google Contacts, Microsoft Exchange (EWS) or any standard CalDAV server.
GermanyEU
LABE is a web-based LDAP Address Book Editor. It makes the setup and use of LDAP addressbooks easy and strives to support a wide range of client software.
Austria
