SmoothSync for Cloud Contacts syncs your iCloud contacts. Due to its implementation as sync adapter it integrates seamlessly with the native contacts app and operates invisible in the background.
This app is bundled with Contact Editor Pro to allow you to edit synced contacts on pre-Android 4 devices.

Also, check out SmoothSync for Cloud Calendar to sync your iCloud calendars!

Samsung S5 users: Please note that some S5 devices come with a broken contacts app that crashes when opening a contact synced by this app. Please report any crashes to Samsung.

Important note for Android 4.1 and Samsung users: To prevent the removal of your accounts on reboot install this app (before you install SmoothSync):
https://play.google.com/store/apps/details?id=org.dmfs.jb.workaround.icloudcontacts
As of Android 4.2 this issue is fixed and the workaround no longer necessary (except for Samsung devices), please uninstall it.

HTC One users please check out this site first: http://dmfs.org/wiki/index.php?title=HTC_Sense_issue

Get support and news via Twitter https://twitter.com/SmoothSync

The app is designed to be as user friendly as possible. Just enter your account data and SmoothSync will keep your contacts in sync.

The app will not sync Contacts from other accounts (like Google) to iCloud!

Please, if you find a bug send me an email. Without detailed error description I often can't do anything especially when I can't reproduce it.

Important! If your phone removes the accounts on reboot, move the App back from SD card to the phone. Some phones (if not all) can't handle sync adapters on SD Card properly. Also check if you need the workaround app mentioned above.

Thanks to the guys at http://www.busymac.com/ for their support!!

Features:
* two-way-sync
* supports multiple accounts
* automatic account discovery
* syncs contact photos
* customizable sync interval (default: 6h, local changes will be synced almost immediately)
* support for custom labels
* encrypts password on the device
* New! One way group sync (iCloud to Android) (two-way-sync of groups will follow)

known limitations:
* relations won't get synced (yet)
* "push" is not supported (yet)

iCloud and Apple are trademarks of Apple Inc., registered in the U.S. and other countries. The author of this app is not related to Apple in any way.

Recent changes:
Please send me an email if something doesn't work. I can't fix issues I'm not aware of. Also, don't forget to install/update the workaround app (see the app description).

-- new in 1.3.2 -
add option to sync relations
show Jelly Bean issue notification on Galaxy S4 devices
improve password encryption
support PTT label on Motorola devices

-- new in 1.3.1 -
Add support for one-way group sync (iCloud to Android). You'll have to re-add your account to make that work. Sorry for the inconvenience.