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

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