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Duo Mobile vs 2FAS: catalog facts
Duo Mobile	2FAS
Free The app is free. The Duo service behind it is a paid product for organisations.	Free Free and open source. Some components are source-available.
Android, iOS	Android, iOS, Browser extension
Verified Push defeats the push-fatigue attacks that plague plain approvals Also works as an ordinary TOTP authenticator for other accounts	Browser extension approves codes on the phone instead of typing them Encrypted backups to your own iCloud or Google Drive account
Built around a Duo deployment that an organisation pays for Closed source	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 22, 2026	Official website Full listing and sources Checked September 22, 2026

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