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Decsync Calendar Sync

File-based calendar and contacts synchronization

Calendar & Contacts ★ 702 stars Medium setup GPL-3.0

Decsync is a method and toolset for synchronizing calendars and contacts via a shared folder rather than a central server. Self-hosters pair it with a file-sync service to keep events consistent across devices.

Official siteSource code

Key features

  • Folder-based sync
  • No central server
  • Calendar and contacts
  • Pairs with any file sync

Pros & cons

Strengths

  • Server-free architecture
  • Privacy friendly

Trade-offs

  • Requires a sync layer
  • Setup is non-trivial

Is Decsync Calendar Sync secure?

OSV.dev has no published security advisories for Decsync Calendar Sync'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.

Decsync Calendar Sync replaces

Self-hosted Google Calendar alternatives

Health badge

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SelfHostIndex: 15 · at risk

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