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GNOME Calendar vs KOrganizer: catalog facts
GNOME Calendar	KOrganizer
Free Free GNOME application supported by donations.	Free Free and open source from the KDE community.
Linux	Linux
Syncs with Nextcloud, Google Calendar and CalDAV servers Local calendars work fully offline	Works with Nextcloud, Kolab, Google Calendar and CalDAV servers Integrated to-dos alongside the agenda view
Designed for the GNOME desktop on Linux Kept deliberately simple, with fewer features than full groupware clients	Best suited to the KDE Plasma desktop Depends on the Kontact/Akonadi stack
Downloadable app	Downloadable app
Open source	Open source
License not stated	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.