Baïkal is a free, open-source, self-hosted calendar and contacts server built on sabre/dav, compatible with iOS, macOS, Thunderbird, and DAVx5.
Baïkal is a lightweight, self-hosted CalDAV and CardDAV server for syncing calendars and contacts. It was created by Jérôme Schneider of Net Gusto together with fruux, with its first commit dating to February 2012, and is now maintained by volunteer contributors under the sabre-io organization.
The project is built on top of sabre/dav, a PHP framework for WebDAV, CalDAV, and CardDAV servers, and adds a web-based administrative interface for managing users, address books, and calendars without editing configuration files by hand.
Baïkal offers a straightforward web admin panel for user, address book, and calendar management, and is compatible with major CalDAV/CardDAV clients including iOS and macOS Calendar/Contacts, DAVx5 on Android, and Mozilla Thunderbird.
Installation requires only a PHP-capable server and either a MySQL or SQLite database, and the project supports both a standard web installer and Docker-based deployment.
Baïkal is completely free and open source under the GNU GPL v3 license, with no paid tiers or hosted offering from the project itself.
Yes, Baïkal is free and open source under the GNU GPL v3 license.
Baïkal supports the CalDAV and CardDAV standards for calendar and contact synchronization.
It requires a PHP-capable web server and either a MySQL or SQLite database.
Baïkal is compatible with iOS and macOS Calendar/Contacts, DAVx5 on Android, Mozilla Thunderbird, and other CalDAV/CardDAV clients.