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KiTTY vs PuTTY-CAC: catalog facts
KiTTY	PuTTY-CAC
Free Free and open source under the MIT licence, like PuTTY.	Free Free to download from the project's GitHub releases page.
Windows	Windows
Session filter and launcher, which PuTTY still does not have Automatic login and command scripts per session	SSH login with smart cards, CAC cards and certificates FIDO key support, including YubiKeys and passkeys
Windows only Last release was September 2023, and it is based on PuTTY 0.76	Windows only Interface keeps PuTTY's dated configuration dialogs
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

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