50,000 - 100,000 downloads

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CalDAV-Sync is a CalDAV client for Android to synchronize events and tasks. Due to its implementation as sync adapter it integrates seamlessly with the native calendar app and widgets. Also check out CardDAV-Sync

To get task support, please install this task app

Since version 0.4 CalDAV-Sync supports read-only sync of webcal ics feeds (via http & https).

Important note for Android 4.1 and Samsung users: To prevent the removal of your accounts on reboot install this app:
Although this issue seems to be fixed in Android 4.2 the workaround is still required on Samsung devices.

Please note that there is a new issue in Android 4.4:
It causes accounts to be removed when an app is updated. Installing the workaround app should help.

This app will create new calendars on your device (one for each calendar on your server account).

Get support and news via Twitter

Please send me an email if you find a bug. Without detailed error description I often can't do anything especially when I can't reproduce it. It's also possible that your server has a bug that CalDAV-Sync can not (yet) tolerate or work around. If you report bugs I can fix them quickly and everyone will benefit.

It is tested and works with
- DAViCal
- SOGo
- Zimbra
- OSX/iCal Server
- eGroupware
- Oracle Beehive
- david.fx
- iCloud
- ownCloud
- many more, see for a list of all servers reported to work

Note to Yahoo!® users: Due to the many issues on Yahoo!'s servers, Yahoo! is no longer officially supported by this app.

Note to users: doesn't support CalDAV. However you should be able to sync your calendar one-way using the Webcal option.

After the installation got to "Settings" > "Accounts & Sync" and create a new Account.

If there is no calendar installed on your device, go to my website and install CalendarProvider.apk and Calendar.apk (FroYo and Gingerbread only)

Once this app reaches version 1.0, I'll make it open source.
See for details on the open source status.


* task support (you'll need this task app
* basic support for self-signed certificates
* supports SNI (needs Android 2.3 and newer)
* supports client certificate authentication (Only Android 4.0 and 4.2 and newer, doesn't work on Android 4.1 yet)
* any number of CalDAV-accounts supported
* automatic calendar discovery (works for most servers)
* auto-provisioning
* supports OAuth2.0 authentication for Google accounts
* syncs multiple alarms
* loads calendar colors from servers if available
* two-way-sync
* sync multiple calendars per account
* full support for time zones
* encrypts passwords in local database
* supports webcal ics feeds (read-only)
* initial support for attachments (Android 4.1 or newer, doesn't work with all calendars apps)
* Dutch, English, French, German, Hebrew, Italian, Polish, Russian translations

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Recently changed in this version

Please send me an email instead of writing a comment if something does not work. Also, please check if you need the workaround app (see the app description).

new in 0.4.9

improve icloud authentication
improve color picker
add experimental option for Yahoo!®
improve SSL compatibility

Comments and ratings for CalDAV-Sync
  • (77 stars)

    by Michael Teel on 01/04/2014

    Got me completely off Google Calendar, which is what I wanted to do. Thanks, Marten Gajda!

  • (77 stars)

    by Christopher Yates on 01/04/2014

    Anything that makes me look clever in front of my wife is a good thing

  • (77 stars)

    by Craig Small on 01/04/2014

    Works fine with owncloud.

  • (77 stars)

    by Ricardo Urresti on 31/03/2014

    Works nicely with Oracle Beehive. I had zero problems, it was easy to configure and in my tablet there is no need to use any extra patch although it runs Android 4.4.2. Raised to 5 stars due its stability.

  • (77 stars)

    by Jim Kellogg on 31/03/2014

    Worked fairly well when first installed. After one day it would not open and could not be used. Don't bother with piece of crap,.

  • (77 stars)

    by Nattapon Sub-Anake on 28/03/2014

    I have problem syncing my office calendar to Android device when I migrated everything from iPhone. And this app is helping me fixing the calendar sync issue. Good job!

  • (77 stars)

    by Kevin Halvarsson on 28/03/2014

    Doesn't seem to work with my Galaxy S2 (I9100) with OwnCloud. Jelly Bean.