Baïkal
Lightweight CalDAV and CardDAV server for calendars and contacts
3.3k stars 317 forks last commit first released GPL-3.0
Actively maintained
Last commit 13 Aug 2026.
Baïkal is a lightweight CalDAV and CardDAV server for hosting calendars and contacts. It provides a web-based administrative interface to manage users, address books, and calendars, while relying on the sabre/dav DAV stack.
Key Features
- CalDAV and CardDAV server for calendar and contact synchronization
- Web interface for managing users, calendars, and address books
- Storage backend support for MySQL and SQLite
- Broad client compatibility with common DAV-capable apps (desktop and mobile)
- Designed to be simple to install on a basic PHP-capable web server
Use Cases
- Self-managed calendar and contact sync for individuals and families
- Small organizations needing DAV services without a full groupware suite
- Central DAV backend for multiple clients (mobile, desktop, and web)
Limitations and Considerations
- Focused on DAV sync and admin management; it is not a full email/groupware suite
Baïkal is a solid choice when you need standards-based CalDAV/CardDAV synchronization with minimal operational complexity. Its lightweight footprint and simple storage options make it well-suited for small deployments that prioritize interoperability and privacy.
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