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Step Two vs Yubico Authenticator: catalog facts
Step Two	Yubico Authenticator
Paid Sold through the App Store and Mac App Store and included in the Setapp subscription.	Free The app is free; it requires a YubiKey, which is bought separately.
macOS, iOS, Browser extension	Windows, macOS, Linux, Android, iOS
iCloud backup and sync across Apple devices Apple Watch app and Safari extension	Secrets stay on the hardware key rather than the device Same codes available on any machine where the key is plugged in
Apple platforms only Sync depends on iCloud	Requires a YubiKey Losing the key loses access to the stored codes unless you have a backup
Downloadable app, Browser extension	Downloadable app
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.