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Yubico Authenticator vs Step Two: catalog facts
Yubico Authenticator	Step Two
Free The app is free; it requires a YubiKey, which is bought separately.	Paid Sold through the App Store and Mac App Store and included in the Setapp subscription.
Windows, macOS, Linux, Android, iOS	macOS, 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	iCloud backup and sync across Apple devices Apple Watch app and Safari extension
Requires a YubiKey Losing the key loses access to the stored codes unless you have a backup	Apple platforms only Sync depends on iCloud
Downloadable app	Downloadable app, Browser extension
Closed 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 24, 2026	Official website Full listing and sources Checked September 24, 2026

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