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PuTTY-CAC vs Solar-PuTTY: catalog facts
PuTTY-CAC	Solar-PuTTY
Free Free to download from the project's GitHub releases page.	Free Free to download and use.
Windows	Windows
SSH login with smart cards, CAC cards and certificates FIDO key support, including YubiKeys and passkeys	Tabbed interface for many sessions at once Saved credentials and private keys for auto-login
Windows only Interface keeps PuTTY's dated configuration dialogs	Windows only Closed source, from a vendor that uses it to promote paid monitoring products
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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