Alternatives to Duo Mobile
Enterprise multi-factor authentication app with push approvals. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
Duo Mobile
Enterprise multi-factor authentication app with push approvals.
Replacements
Listings that take over the same core job as Duo Mobile.
Microsoft Authenticator
Microsoft's mobile authenticator app for multi-factor and passwordless sign-in to personal and work accounts.
Microsoft Authenticator also handles multi-factor sign-in for work accounts, with passwordless sign-in inside the Microsoft ecosystem, and is likewise closed source and mobile only.
Google Authenticator
Google's mobile app that generates one-time verification codes for two-step verification.
Google Authenticator generates TOTP codes offline with optional Google Account sync, without the push approvals of an organisation's Duo deployment.
2FAS
Open-source authenticator app with browser-extension push approvals.
2FAS is open source and free, with push approvals through a browser extension instead of an organisation's paid Duo deployment.
Authy
Mobile two-factor authenticator with encrypted cloud backup.
Authy offers encrypted backup and multi-device sync on Android and iOS, but it is closed source and account recovery is tied to a phone number.
Ente Auth
Open-source two-factor authenticator with end-to-end encrypted backups.
Ente Auth is open source and adds desktop and web clients with free end-to-end encrypted cloud backup, though backup relies on an Ente account.
Aegis Authenticator
An encrypted two-factor authentication app for Android with real backups and imports from every other authenticator.
Aegis is open source with an encrypted vault, automatic backups you control and broad imports, but it runs only on Android with no cloud sync.
FreeOTP
An open-source two-factor authentication app for Android and iOS that generates one-time codes.
FreeOTP is a free open-source mobile app available on F-Droid as well as Google Play and the App Store, with minimal documentation.
Bitwarden Authenticator
A standalone mobile app from Bitwarden that generates and stores two-step verification codes.
Bitwarden Authenticator is a free standalone mobile app from a password manager vendor, but few import, export or backup details are published.
Similar software
Related functionality, not a direct replacement.
Proton Authenticator
A free two-factor authentication app from Proton with end-to-end encrypted sync between your devices and no advertising.
Bitwarden
An open-source password manager with free cross-device sync, apps for every platform and optional paid plans.
1Password
Subscription password manager for individuals and families that stores, fills and shares passwords and passkeys.
Psono
Self-hostable password manager aimed at companies and developers.
