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Merkuro vs Kontact: catalog facts
Merkuro	Kontact
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source, developed by the KDE community.
Linux	Linux
Supports Nextcloud, Google Calendar, Outlook and CalDAV calendars Combines events, tasks and contacts in one app	Mail, calendar, contacts and feeds in one window Works offline with your data
Linux only Fits best within the KDE Plasma desktop	Best suited to the KDE Plasma desktop Large suite with many settings to learn
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	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 1, 2026	Official website Full listing and sources Checked September 24, 2026

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