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PuTTY-CAC vs OpenSSH for Windows (mls-software): catalog facts
PuTTY-CAC	OpenSSH for Windows (mls-software)
Free Free to download from the project's GitHub releases page.	Free Free to download.
Windows	Windows, Command line
SSH login with smart cards, CAC cards and certificates FIDO key support, including YubiKeys and passkeys	Tracks current OpenSSH releases Builds still available for Windows 2000, XP and 2003
Windows only Interface keeps PuTTY's dated configuration dialogs	Maintained by a single small site Website is plain and sparse on documentation
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
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 October 1, 2026

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