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khard vs Kontact: catalog facts
khard	Kontact
Free Free and open source.	Free Free and open source, developed by the KDE community.
macOS, Linux, Command line	Linux
Works on plain vCard files Fits terminal mail setups	Mail, calendar, contacts and feeds in one window Works offline with your data
No built-in sync; needs a separate CardDAV tool Command line only	Best suited to the KDE Plasma desktop Large suite with many settings to learn
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 24, 2026

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