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PuTTY-CAC vs PuTTY: catalog facts
PuTTY-CAC	PuTTY
Free Free to download from the project's GitHub releases page.	Free Free and open source under the MIT licence.
Windows	Windows, Linux, macOS
SSH login with smart cards, CAC cards and certificates FIDO key support, including YubiKeys and passkeys	One small executable that runs without installation A full suite: PSCP and PSFTP for files, Plink for scripts, Pageant as a key agent
Windows only Interface keeps PuTTY's dated configuration dialogs	The interface shows its age next to modern terminals There is no Mac port from the project; the Unix build is X11-based
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 20, 2026

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