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Kontact vs Kairos: catalog facts
Kontact	Kairos
Free Free and open source, developed by the KDE community.	Free Free and open source under the GPL-3.0 or later licence.
Linux	Linux
Mail, calendar, contacts and feeds in one window Works offline with your data	Designed for touch input on tablets Works well alongside tiling window managers
Best suited to the KDE Plasma desktop Large suite with many settings to learn	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 September 24, 2026	Official website Full listing and sources Checked October 1, 2026

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