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DAVx⁵ is the only all-in-one app for all things CalDAV CardDAV and WebDAV! It is a fully-featured sync 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. DAVx⁵ can also be used to access your remote WebDAV files.

Want to keep track of tasks notes and journals? Try jtxBoard:
https://play.google.com/store/apps/details?id=at.techbee.jtx
DAVx⁵ can synchronize everything from jtx Board with your own server!

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

After installing you can add a DAVx⁵ account for CalDAV and CardDAV from within the app. See https://www.davx5.com/tested-with/ for help. For more information please see the manual: https://www.davx5.com/manual/ the FAQ: https://www.davx5.com/faq/ and our forums: https://www.davx5.com/forums/

Key features:

⊛ Sync your Calendars (CalDAV) and address-books (CardDAV) and Tasks (VTODO via CalDAV) in a single app
⊛ Two-way synchronization (server ↔ client)
⊛ Access your WebDAV files and work with remote storages — seamlessly just as they would be local on the device
⊛ 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.
⊛ Management options within the app (Create and Delete new calendars address books and to-do lists*)
⊛ Super-secure and we respect your privacy!
⊛ Absolutely no ads and no tracking.
⊛ GDPR compliant.
⊛ DAVx⁵ is completely open source

* depends on server implementation / may be not supported by all servers

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 / WebDAV storage 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 separate business version with Enterprise features like mass-deployment and pre-configurable settings: https://www.davx5.com/organizations/managed-davx5