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Aegis Authenticator vs Duo Mobile: catalog facts
Aegis Authenticator	Duo Mobile
Free Free and open source under the GPL, with no accounts and no paid tier.	Free The app is free. The Duo service behind it is a paid product for organisations.
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	Verified Push defeats the push-fatigue attacks that plague plain approvals Also works as an ordinary TOTP authenticator for other accounts
Android only No cloud sync; you own the backup process	Built around a Duo deployment that an organisation pays for Closed source
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 22, 2026

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