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Calindori vs KOrganizer: catalog facts
Calindori	KOrganizer
Free Free and open source under the GPL-3.0 or later licence.	Free Free and open source from the KDE community.
Linux	Linux
Stores calendars in the standard iCal format Handles both events and to-do items	Works with Nextcloud, Kolab, Google Calendar and CalDAV servers Integrated to-dos alongside the agenda view
Linux only Basic feature set compared with full desktop calendar suites	Best suited to the KDE Plasma desktop Depends on the Kontact/Akonadi stack
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.