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Google Authenticator vs Duo Mobile: catalog facts
Google Authenticator	Duo Mobile
Free Free to download and use.	Free The app is free. The Duo service behind it is a paid product for organisations.
Android, iOS	Android, iOS
Generates codes without a network connection Optional sync of codes across devices via a Google Account	Verified Push defeats the push-fatigue attacks that plague plain approvals Also works as an ordinary TOTP authenticator for other accounts
Cloud sync ties your codes to a Google Account Not open source	Built around a Duo deployment that an organisation pays for Closed source
Downloadable app	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
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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