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Microsoft Authenticator vs 2FAS: catalog facts
Microsoft Authenticator	2FAS
Free Free app from Microsoft for Android and iOS.	Free Free and open source. Some components are source-available.
Android, iOS	Android, iOS, Browser extension
Passwordless sign-in for Microsoft and work accounts Commonly required by employers using Microsoft sign-in	Browser extension approves codes on the phone instead of typing them Encrypted backups to your own iCloud or Google Drive account
Mobile only, with no desktop app Most useful inside the Microsoft account ecosystem	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 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.