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KOrganizer vs Kairos: catalog facts
KOrganizer	Kairos
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	Designed for touch input on tablets Works well alongside tiling window managers
Best suited to the KDE Plasma desktop Depends on the Kontact/Akonadi stack	Young project with little documentation Linux only
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.