DAVx⁵ APK 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.

Compatible with almost every CalDAV/CardDAV servers and services, including Nextcloud, iCloud and Synology!

After installing, you can add a DAVx⁵ account from within the app.

Key Features of DAVx⁵ APK

• Sync your DAV calendars (CalDAV) and address-books (CardDAV) and Tasks in a single app
• Two-way synchronization (server ↔ client)
• 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, multi-threaded sync)
• Optimized for phones and tablets. Backward compatibility for old Android versions.
• Super-secure and we respect your privacy!
• Absolutely no ads and no tracking.
• GDPR compliant.
• DAVx⁵ is completely open source

Important compatibility notes

Attention: DAVx⁵ must not be moved to the SD card! This will cause strange behaviour, including account and data loss.

Get the best out of this app

• 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

Successfully tested with

• 1CRM
• A1.net
• all-inkl.com
• AOL Mail
• Baïkal
• Bitrix24
• Calendar and Contacts Server
• cPanel
• Cyrus IMAP
• DAViCal
• DavMail Gateway
• Daylite
• EDIS
• EGroupware
• Fastmail
• fruux
• GMX
• Google
• Group Office
• Hetzner KonsoleH
• Horde
• IceWarp
• iCloud
• Kerio Connect
• Kolab Now
• Kopano
• luckycloud
• macOS Server
• mail.de
• mail.ru
• mailbox.org
• Mailfence
• MDaemon
• Nextcloud
• openCRX
• Oracle Beehive
• Oracle Communications UCS
• ownCloud
• OwnCube
• Posteo
• Radicale
• SmarterMail
• SOGo
• Synology DSM
• Teambox
• Tine 2.0
• T-Online
• web.de
• Xandikos
• Yahoo Mail! (calendar only)
• Yandex
• Zimbra
• Zoho

and many others: https://www.davx5.com/tested-with/

Also available as a seperate business version with Enterprise features like mass-deployment and pre-configurable settings: https://www.davx5.com/organizations/managed-davx5