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KOrganizer vs GNOME Calendar: catalog facts
KOrganizer	GNOME Calendar
Free Free and open source from the KDE community.	Free Free GNOME application supported by donations.
Linux	Linux
Works with Nextcloud, Kolab, Google Calendar and CalDAV servers Integrated to-dos alongside the agenda view	Syncs with Nextcloud, Google Calendar and CalDAV servers Local calendars work fully offline
Best suited to the KDE Plasma desktop Depends on the Kontact/Akonadi stack	Designed for the GNOME desktop on Linux Kept deliberately simple, with fewer features than full groupware clients
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 2, 2026	Official website Full listing and sources Checked October 1, 2026

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