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khard vs vCard Studio: catalog facts
khard	vCard Studio
Free Free and open source.	Free Free, released under CC0-1.0.
macOS, Linux, Command line	Windows, Linux
Works on plain vCard files Fits terminal mail setups	Merge, split and deduplicate vCard files Wide range of import and export formats
No built-in sync; needs a separate CardDAV tool Command line only	Releases are infrequent; latest is 1.5.0 from 2024 No macOS or mobile versions
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License: CC0-1.0
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 October 1, 2026

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