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Communications protocol
OSI layer Application
Port(s) Any
RFC(s) RFC 4791, RFC 6638

Calendaring Extensions to WebDAV, or CalDAV, is an Internet standard allowing a client to access scheduling information on a remote server. It extends WebDAV (HTTP-based protocol for data manipulation) specification and uses iCalendar format for the data. The access protocol is defined by RFC 4791. It allows multiple client access to the same information thus allowing cooperative planning and information sharing. Many server and client applications support the protocol. Extensions to CalDAV for automated scheduling are also standardized, as RFC 6638.


The CalDAV specification was first published in 2003 as an Internet Draft submitted to the Internet Engineering Task Force (IETF) by Lisa Dusseault. In March 2007, the CalDAV specification was finished and published by the IETF as RFC 4791, authored by Cyrus Daboo (Apple), Bernard Desruissaux (Oracle), and Lisa Dusseault (CommerceNet). CalDAV is designed for implementation by any collaborative software, client or server, that needs to maintain, access or share collections of events. It is developed as an open standard to foster interoperability between software from different implementers.[clarification needed]


The architecture of CalDAV (partially inherited from the underlying specifications) organizes the data (events, tasks, free-busy info, notes) in directories (collections), where multiple items (resources) reside. The resources and collections can be accessed by one or more users, using standard HTTP and DAV semantics to detect conflicting changes, or to provide locking.

For access control the concept of ACLs are used, so each operation (view, edit, delete etc.) can be denied or granted per user. Therefore, the specification requires that CalDAV servers must support "WebDAV Access Control Protocol" (RFC 3744). The calendar resources must use iCalendar format, which allows the server to understand and process the data. Parsing the iCalendar items is necessary, because the server has to support a number of calendaring-specific operations such as doing free-busy time reports and expansion of recurring events. With this functionality, a user may synchronize his or her own calendar to a CalDAV server, and share it among multiple devices or with other users. The protocol also supports non-personal calendars, such as calendars for sites or organizations.



The list of CalDAV clients includes:[1]


The list of CalDAV server includes:[11]

See also[edit]


  1. ^ "CalDAV Clients (English)". 2010-09-18. Retrieved 2010-12-17. 
  2. ^ TaskSync
  3. ^ CalDAV-Sync
  4. ^ CalendarSync
  5. ^ DAVdroid
  6. ^ CalDavZAP
  7. ^ EVO Collaborator for Outlook
  8. ^ a b Horde Groupware
  9. ^ Outlook CalDav Synchronizer
  10. ^ iCal Import/Export CalDAV
  11. ^ "CalDAV Servers (English)". Retrieved 2014-01-07. 
  12. ^ Baikal
  13. ^ Bedework
  14. ^ Bynari Collaboration Suite
  15. ^ DAViCal
  16. ^ DPCalendar
  17. ^ Daylite CalDAV Server
  18. ^ EVO Mail Server
  19. ^ Google Calendar
  20. ^ Kerio Connect
  21. ^ Oracle Communications Calendar Server
  22. ^ Radicale
  23. ^ SOGo
  24. ^ sabre/dav
  25. ^ Scalix
  26. ^ Synovel
  27. ^ Zimbra
  28. ^ mod_caldav auf SourceForge
  29. ^ ownCloud
  30. ^ sync!Egw

External links[edit]