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DAVdroid is the only all-in-one synchronization solution for your contacts (CardDAV), calendars (CalDAV) and your tasks (based on VTODO). The app is easy to set up and integrates perfectly with your favorite calendar/contacts app (including default apps). It can also be used seperately, if you either have CalDAV, CardDAV or only Tasks.
After installing, you can add a DAVdroid account from within the app. See https://www.davdroid.com/tested-with/ for help. For more information, please see the manual: https://www.davdroid.com/manual/, the FAQ: https://www.davdroid.com/faq/ and our forums: https://www.davdroid.com/forums/
⊛ Sync your DAV calendars (CalDAV) and address-books (CardDAV) and Tasks in a single app
⊛ Two-way synchronization (server ↔ client)
⊛ Native Android 4+ implementation
⊛ Flawless integration with your device and favorite apps
⊛ Easy setup (resource auto-detection, support for self-signed certificates, authentication by client certificates)
⊛ Fast algorithms for high performance (CTag/ETag, limit sync time range for past events)
⊛ Optimized for phones and tablets
⊛ Super-secure and we respect your privacy!
⊛ DAVdroid is completely open source
Attention: DAVdroid must not be moved to the SD card! This will cause strange behaviour, including account and data loss.
⊛ … when using with your own DAV server (Radicale, DAViCal, SabreDAV, Baikal, …) and HTTPS – so you own and control all your data while having the comfort of synchronization between various devices. Or use a hosted DAV service you trust or the one of your company.
⊛ … and combine it with Evolution / Thunderbird / etc. on your computer
⊛ Source code is available (see homepage)
⊛ No need for giving your contacts/calendars to Facebook, Google, etc. Use your own server (or a trusted one)!
⊛ TLS is recommended to protected your communication so synchronization is secure even when using open Wi-Fi networks.
⊛ Apple's Calendar and Contacts Server
⊛ Apple iCloud
⊛ Kerio Connect
⊛ Mac OS X Server
⊛ Oracle Communications UCS
⊛ Synology DSM
⊛ Tine 2.0
⊛ Yahoo (calendars only)
⊛ Zimbra Server
⊛ … and many others: https://www.davdroid.com/tested-with/