What is DAVx⁵ used for?

DAVx⁵ is an Android app that syncs contacts, calendars and tasks over CalDAV and CardDAV and gives access to WebDAV files. It is a good fit for syncing calendars with a self-hosted Nextcloud-style server and moving contacts off a vendor cloud.

Is DAVx⁵ open source?

Yes. DAVx⁵ is open source under the GPL-3.0 licence. Its source code is on GitHub at bitfireAT/davx5-ose and is written mainly in Kotlin.

Yes. DAVx⁵ is open source, so the software itself is free to use. Paid plans are also available, starting at €1.49 per seat per month.

Can I self-host DAVx⁵?

Yes. DAVx⁵ can be self-hosted on your own server or infrastructure.

What is DAVx⁵ an alternative to?

DAVx⁵ is an open-source alternative to Google Calendar. Other open-source alternatives to Google Calendar include Radicale, Baïkal and Manage My Damn Life.

Is DAVx⁵ actively maintained?

Yes. The most recent commit to DAVx⁵ was on 2 October 2026, and the latest release is v4.5.20-ose, published on 27 September 2026. The project has 2.9k stars on GitHub.

DAVx⁵: open-source alternative to Google Calendar

About DAVx⁵

DAVx5 is an open-source CalDAV and CardDAV synchronization app for Android. It keeps contacts, calendars and tasks on a phone in sync with a server that speaks those open standards, and it can also open online files over WebDAV through Android's Storage Access Framework. The project is focused on privacy and works with self-hosted servers as well as hosted ones.

Setup is designed to be easy, with automatic configuration for supported services. The project website lists the services DAVx5 has been tested with, along with a manual and an FAQ. Parts of the codebase have been split into reusable libraries: cert4android for custom certificate handling, dav4jvm as a WebDAV, CalDAV and CardDAV framework, and synctools for iCalendar and vCard processing.

The app is written in Kotlin and licensed under GPLv3. Support, contribution and security disclosure policies are documented, and news is posted on Mastodon. The README asks people who want to back development to donate or purchase the app, so the open-source edition coexists with a paid distribution.

Key features

CalDAV and CardDAV sync on Android
Contacts, calendars and tasks synchronization
WebDAV file access via Storage Access Framework
Automatic configuration for tested services
Works with self-hosted servers

Good fit for

→Syncing calendars with a self-hosted Nextcloud-style server
→Moving contacts off a vendor cloud

Built with: Kotlin
Tags: caldav; carddav; webdav; android; calendar-sync; contacts; privacy; kotlin

DAVx⁵: questions and answers

What is DAVx⁵ used for?: DAVx⁵ is an Android app that syncs contacts, calendars and tasks over CalDAV and CardDAV and gives access to WebDAV files. It is a good fit for syncing calendars with a self-hosted Nextcloud-style server and moving contacts off a vendor cloud.
Is DAVx⁵ open source?: Yes. DAVx⁵ is open source under the GPL-3.0 licence. Its source code is on GitHub at bitfireAT/davx5-ose and is written mainly in Kotlin.
Is DAVx⁵ free?: Yes. DAVx⁵ is open source, so the software itself is free to use. Paid plans are also available, starting at €1.49 per seat per month.
Can I self-host DAVx⁵?: Yes. DAVx⁵ can be self-hosted on your own server or infrastructure.
What is DAVx⁵ an alternative to?: DAVx⁵ is an open-source alternative to Google Calendar. Other open-source alternatives to Google Calendar include Radicale, Baïkal and Manage My Damn Life.
Is DAVx⁵ actively maintained?: Yes. The most recent commit to DAVx⁵ was on 2 October 2026, and the latest release is v4.5.20-ose, published on 27 September 2026. The project has 2.9k stars on GitHub.