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DAVx5

CalDAV/CardDAV sync client for Android

Calendar & Contacts ★ 2.9k stars Easy setup GPL-3.0

DAVx5 is an open-source CalDAV and CardDAV synchronization client for Android, written in Kotlin. It connects the native Android calendar, contacts, and tasks apps to any compatible server, such as Nextcloud or Radicale, for two-way sync.

Official siteSource code

Key features

  • CalDAV and CardDAV sync
  • Native Android integration
  • Two-way synchronization
  • Works with any server

Strengths

  • Released under the GPL-3.0 license
  • Easy to set up — beginner-friendly
  • Active community (2.9k GitHub stars)
  • Written in Kotlin

Is DAVx5 secure?

OSV.dev has no published security advisories for DAVx5's repository. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

Source: OSV.dev, checked 2026-10-14. How this is measured.

DAVx5 replaces

Self-hosted Google Calendar Sync alternativesSelf-hosted iCloud sync alternatives

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SelfHostIndex: 87 · excellent

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