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PuTTY-CAC vs Termius: catalog facts
PuTTY-CAC	Termius
Free Free to download from the project's GitHub releases page.	Freemium Pricing details were not captured; check the site for current plans.
Windows	Windows, macOS, Linux, Android, iOS
SSH login with smart cards, CAC cards and certificates FIDO key support, including YubiKeys and passkeys	Apps for desktop and mobile platforms Syncs hosts, keys and snippets between devices
Windows only Interface keeps PuTTY's dated configuration dialogs	Proprietary software Syncing depends on the vendor's service
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.