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Microsoft Authenticator vs Aegis Authenticator: catalog facts
Microsoft Authenticator	Aegis Authenticator
Free Free app from Microsoft for Android and iOS.	Free Free and open source under the GPL, with no accounts and no paid tier.
Android, iOS	Android
Passwordless sign-in for Microsoft and work accounts Commonly required by employers using Microsoft sign-in	The vault is encrypted with AES-256-GCM, unlocked by password with scrypt or by biometrics Automatic backups of the vault to a location you choose, plain or encrypted
Mobile only, with no desktop app Most useful inside the Microsoft account ecosystem	Android only No cloud sync; you own the backup process
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 21, 2026

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