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Yubico Authenticator vs 2FAS: catalog facts
Yubico Authenticator	2FAS
Free The app is free; it requires a YubiKey, which is bought separately.	Free Free and open source. Some components are source-available.
Windows, macOS, Linux, Android, iOS	Android, iOS, Browser extension
Secrets stay on the hardware key rather than the device Same codes available on any machine where the key is plugged in	Browser extension approves codes on the phone instead of typing them Encrypted backups to your own iCloud or Google Drive account
Requires a YubiKey Losing the key loses access to the stored codes unless you have a backup	Mobile-first; there is no standalone desktop app Push approval needs the browser extension installed on each machine
Downloadable app	Downloadable app, Browser extension
Closed source	Open source
License not stated	License not stated
Not stated if an account is 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 September 24, 2026	Official website Full listing and sources Checked September 22, 2026

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