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Yubico Authenticator vs Aegis Authenticator: catalog facts
Yubico Authenticator	Aegis Authenticator
Free The app is free; it requires a YubiKey, which is bought separately.	Free Free and open source under the GPL, with no accounts and no paid tier.
Windows, macOS, Linux, Android, iOS	Android
Secrets stay on the hardware key rather than the device Same codes available on any machine where the key is plugged 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
Requires a YubiKey Losing the key loses access to the stored codes unless you have a backup	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 24, 2026	Official website Full listing and sources Checked September 21, 2026

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