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KOrganizer vs Merkuro: catalog facts
KOrganizer	Merkuro
Free Free and open source from the KDE community.	Free Free and open source under the GPL-3.0-or-later licence.
Linux	Linux
Works with Nextcloud, Kolab, Google Calendar and CalDAV servers Integrated to-dos alongside the agenda view	Supports Nextcloud, Google Calendar, Outlook and CalDAV calendars Combines events, tasks and contacts in one app
Best suited to the KDE Plasma desktop Depends on the Kontact/Akonadi stack	Linux only Fits best within the KDE Plasma desktop
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0-or-later
No account needed	Not stated if an account is needed
Works offline	Not stated if it 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.