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PuTTY-CAC vs KiTTY: catalog facts
PuTTY-CAC	KiTTY
Free Free to download from the project's GitHub releases page.	Free Free and open source under the MIT licence, like PuTTY.
Windows	Windows
SSH login with smart cards, CAC cards and certificates FIDO key support, including YubiKeys and passkeys	Session filter and launcher, which PuTTY still does not have Automatic login and command scripts per session
Windows only Interface keeps PuTTY's dated configuration dialogs	Windows only Last release was September 2023, and it is based on PuTTY 0.76
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 21, 2026

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