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FreeOTP vs Duo Mobile: catalog facts
FreeOTP	Duo Mobile
Free Free and open source.	Free The app is free. The Duo service behind it is a paid product for organisations.
Android, iOS	Android, iOS
Open source with public repositories for both apps Available on F-Droid as well as Google Play and the App Store	Verified Push defeats the push-fatigue attacks that plague plain approvals Also works as an ordinary TOTP authenticator for other accounts
Mobile only, no desktop app Minimal project website with little documentation	Built around a Duo deployment that an organisation pays for Closed source
Downloadable app	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 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.