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Open Passkey Authenticator vs Authnkey: catalog facts
Open Passkey Authenticator	Authnkey
Free Free and open source under the EUPL-1.2.	Free Free and open source under the MIT licence.
Android	Android
Stores passkeys on the device through Android Credential Manager Works with FIDO hardware keys over NFC and USB	Adds PIN entry and passkeys for keys that Android supports poorly Works with security keys over both NFC and USB
Requires Android 13 or later Small project with few contributors	Needs a physical FIDO2 security key No packaged releases on GitHub; install through F-Droid
Downloadable app	Downloadable app
Open source	Open source
License: EUPL-1.2	License: MIT
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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