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Merkuro vs Kairos: catalog facts
Merkuro	Kairos
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source under the GPL-3.0 or later licence.
Linux	Linux
Supports Nextcloud, Google Calendar, Outlook and CalDAV calendars Combines events, tasks and contacts in one app	Designed for touch input on tablets Works well alongside tiling window managers
Linux only Fits best within the KDE Plasma desktop	Young project with little documentation Linux only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-or-later
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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