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2FAS vs Yubico Authenticator: catalog facts
2FAS	Yubico Authenticator
Free Free and open source. Some components are source-available.	Free The app is free; it requires a YubiKey, which is bought separately.
Android, iOS, Browser extension	Windows, macOS, Linux, Android, iOS
Browser extension approves codes on the phone instead of typing them Encrypted backups to your own iCloud or Google Drive account	Secrets stay on the hardware key rather than the device Same codes available on any machine where the key is plugged in
Mobile-first; there is no standalone desktop app Push approval needs the browser extension installed on each machine	Requires a YubiKey Losing the key loses access to the stored codes unless you have a backup
Downloadable app, Browser extension	Downloadable app
Open source	Closed 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 22, 2026	Official website Full listing and sources Checked September 24, 2026

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