Compare software

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