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Authnkey vs Passchain: catalog facts
Authnkey	Passchain
Free Free and open source under the MIT licence.	Free Free and open source under the Apache-2.0 licence.
Android	Android
Adds PIN entry and passkeys for keys that Android supports poorly Works with security keys over both NFC and USB	Uses USB and NFC hardware security keys for passkeys Can use the phone's secure element instead of a key
Needs a physical FIDO2 security key No packaged releases on GitHub; install through F-Droid	Bluetooth security keys are not supported yet Android only
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: Apache-2.0
No account needed	Not stated if an account is 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.