1.3K reviews
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About this app

CardDAV-Sync is a CardDAV client for Android to synchronize contacts. Due to its implementation as sync adapter it integrates seamlessly with the default contacts app.
(Also check out CalDAV-Sync)

Important note for Android 4.1 and Samsung users: To prevent the removal of your accounts on reboot install this app:
At present, Samsung users still need this workaround, even on recent devices.

Also note that many Android 4.x and 5.0 devices need the workaround to prevent removal of accounts during an app update.

HTC One users please check out this site first:

Get support and news via Twitter

If you find a bug send me an email please. 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 CardDAV-Sync can not (yet) tolerate or work around. If you report bugs I can fix them quickly and everyone will benefit.

This is the paid version of CardDAV-Sync. It equals the free version except that it syncs more fields. Visit my website for details.

Please uninstall the free version before you install the paid one (and vice versa).

For users which are unable to edit or create synced contacts I published an editor at the market. Just search for "Contact Editor" or see our website.

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


* Sync contacts from a CardDAV-server (tested and reported to work with DAViCal, SOGo, egroupware, Zimbra, david.fx, Fruux, ownCloud ... and more. See our website for details)

* supports multiple address books per account

* basic support for self-signed certificates

* auto-provisioning

* two-way-sync

* syncs names, phone numbers, email addresses, postal addresses, photos, birthdays (but please visit "date formats" on my website first), notes, instant messengers, organizations, nicknames, categories (groups), phonetic names, related names and websites

* automatic address book discovery (works with most servers in default configuration)

* one-way-sync of Apple-style groups

* Support for Apple-style custom labels (X-ABLABEL)

* stores passwords encrypted

* supports efficient sync-collection request

* supports client certificate authentication

* import wizard for contacts from other accounts
Updated on
Jun 28, 2017

Data safety

Developers can show information here about how their app collects and uses your data. Learn more about data safety
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1.3K reviews
Winston Smith
July 9, 2021
Used ho be a great carddav syncing app but it's been abandoned. --- I had a problem with syncing for a while. Turned out the problem was in the system settings. For some of you who encounter the same problem, try to check these settings: 1. Battery saver (give no restrictions to carddav/caldav-sync) 2. Permissions to auto start (make sure the app is allowed to start automatically) 3. Permissions to start in the background (self explanatory) Now I can sync seamlessy with Fastmail, iCloud & Gmail
7 people found this review helpful
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A Google user
March 9, 2020
Suddenly it stopped working and my local contact book stays empty. If I force sync, it does nothing, no status or error. I can see in Fasmail that the app password has not been used in 10 days. No battery saver, but it worked with saver for long time and if a sync manually it shouldn't matter.
7 people found this review helpful
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Chris Bennett
May 15, 2020
My home rolled certificate (which worked with this app before and still works with everything else) stopped working a few months ago. I hope the developer who has been so helpful in the past will be on top of this and get the app updated quickly to work again. Unfortunately I am beginning to suspect that development and support has ceased :-(
7 people found this review helpful
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What's new

Fix authentication issues