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Kontact vs Cardhop: catalog facts
Kontact	Cardhop
Free Free and open source, developed by the KDE community.	Freemium Free to start, with paid features from Flexibits.
Linux	macOS, iOS
Mail, calendar, contacts and feeds in one window Works offline with your data	Natural language input for adding and editing contacts Quick access from the menu bar
Best suited to the KDE Plasma desktop Large suite with many settings to learn	Apple platforms only Full features require payment
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
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.