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Reminders vs KOrganizer: catalog facts
Reminders	KOrganizer
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source from the KDE community.
Linux	Linux
Recurring reminders and scheduled notifications Lists, search, sorting and filtering	Works with Nextcloud, Kolab, Google Calendar and CalDAV servers Integrated to-dos alongside the agenda view
Linux only Small project with a modest feature set	Best suited to the KDE Plasma desktop Depends on the Kontact/Akonadi stack
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License not stated
No account needed	No account needed
Not stated if it 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.