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Mobile app · Office & notes

CalSync - Local Calendar Sync

Sync local calendars offline. Free, open source, no account needed.

  • Completely free
  • Android
  • Open source

Overview

Features described in its F-Droid listing: offline use.

Requires an internet connection.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “📱 WORKS OFFLINE — No internet connection required, ever” — F-Droid, 10 November 2026
  • “📱 WORKS OFFLINE — No internet connection required, ever” — F-Droid, 10 November 2026
  • “🎨 MATERIAL YOU — Adapts to your device's dynamic color theme” — F-Droid, 10 November 2026

At a glance

All of CalSync - Local Calendar Sync is free: no feature is locked behind a paid plan, and its code is open.

Its licence (GPL-3.0) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

  • Open source code
  • No advertising
  • Commercial use allowed

Sources and checks

  • Facts collected from F-Droid (credit card, source code, publisher, licence, free status, platforms, ads, commercial use, version) —
  • Last technical check: 6 November 2026
  • Description from F-Droid — F-Droid (citation courte)

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