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Chiri vs KOrganizer: catalog facts
Chiri	KOrganizer
Free Free and open source under the zlib licence.	Free Free and open source from the KDE community.
Windows, macOS, Linux	Linux
Uses the open CalDAV standard instead of a proprietary sync service Cross-platform desktop app	Works with Nextcloud, Kolab, Google Calendar and CalDAV servers Integrated to-dos alongside the agenda view
Needs a CalDAV server to sync tasks Young project with a small user base	Best suited to the KDE Plasma desktop Depends on the Kontact/Akonadi stack
Downloadable app	Downloadable app
Open source	Open source
License: Zlib	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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