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vdirsyncer

Synchronize calendars and contacts via CalDAV/CardDAV

Calendar & Contacts ★ 1.9k stars Medium setup BSD-3-Clause

vdirsyncer is a command-line tool that synchronizes calendars and address books between a local storage and CalDAV/CardDAV servers. It is commonly used to keep self-hosted calendar data in sync with local clients.

Official siteSource code

Key features

  • Sync calendars and contacts
  • CalDAV and CardDAV support
  • Pairs with khal and other clients

Strengths

  • Released under the BSD-3-Clause license
  • Active community (1.9k GitHub stars)
  • Written in Python
  • Tiny footprint — runs in 64 MB RAM

Is vdirsyncer secure?

OSV.dev has no published security advisories for vdirsyncer'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.

vdirsyncer replaces

Self-hosted iCloud sync alternatives

Health badge

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SelfHostIndex: 65 · good

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