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vCard Studio vs khard: catalog facts
vCard Studio	khard
Free Free, released under CC0-1.0.	Free Free and open source.
Windows, Linux	macOS, Linux, Command line
Merge, split and deduplicate vCard files Wide range of import and export formats	Works on plain vCard files Fits terminal mail setups
Releases are infrequent; latest is 1.5.0 from 2024 No macOS or mobile versions	No built-in sync; needs a separate CardDAV tool Command line only
Downloadable app	Downloadable app
Closed source	Open source
License: CC0-1.0	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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