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khard vs BusyContacts: catalog facts
khard	BusyContacts
Free Free and open source.	Paid Costs $49.99 USD with a 14-day free trial; also available through Setapp.
macOS, Linux, Command line	macOS
Works on plain vCard files Fits terminal mail setups	Direct sync with iCloud, Google, Exchange and CardDAV Tags, smart filters and per-contact activity history
No built-in sync; needs a separate CardDAV tool Command line only	macOS only One-time paid purchase after the trial
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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