5 Best Free and Open Source CardDAV Servers

CardDAV (“Card Distributed Authoring and Versioning”) is a standardized address book client/server protocol for managing and sharing contact information over the internet.

This is an extension of the WebDAV (Web Distributed Authoring and Versioning) protocol, which is used for collaborative editing and managing files on remote web servers.

CardDAV focuses on the synchronization and management of address book or contact data.

What does CardDAV offer?

  • Synchronize address books or contact lists between different devices and applications. This lets users to maintain a consistent set of contacts across email clients, smartphones, and other devices.
  • Platform-independent, making it suitable for use on different operating systems and devices. It’s commonly used with email clients, calendar apps, and contact management software.
  • Open and standardized protocol, defined by the Internet Engineering Task Force (IETF). This openness promotes interoperability between different software and services that implement the protocol.
  • Used with secure connections (HTTPS) to ensure the privacy and integrity of contact data during transmission. It also supports authentication mechanisms for secure access control.
  • Users can add, modify, delete, and organize contact information, such as names, email addresses, phone numbers, and more, in their address books.
  • CardDAV servers store contact data, allowing users to access their contacts from anywhere with an internet connection. This is especially useful for users who want to maintain a centralized address book accessible across multiple devices.

There’s a fairly small range of CardDAV servers available for Linux. We’ve summarised our findings in the rating chart below. Only free and open source software is eligible for inclusion.

Ratings chart for the best free and open source CardDAV servers

Learn more about the CardDAV servers. Click the links in the table below to learn more about each server.

CardDAV Servers
sabre/davCreate WebDAV, CalDAV and CardDAV servers
RadicaleSmall but powerful CalDAV and CardDAV server
BaïkalExtensive web interface managing users, address books and calendars
XandikosLightweight and complete CardDAV/CalDAV server
MiltonWebDAV / CalDAV / CardDAV server library
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