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Passchain vs Open Passkey Authenticator: catalog facts
Passchain	Open Passkey Authenticator
Free Free and open source under the Apache-2.0 licence.	Free Free and open source under the EUPL-1.2.
Android	Android
Uses USB and NFC hardware security keys for passkeys Can use the phone's secure element instead of a key	Stores passkeys on the device through Android Credential Manager Works with FIDO hardware keys over NFC and USB
Bluetooth security keys are not supported yet Android only	Requires Android 13 or later Small project with few contributors
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: EUPL-1.2
Not stated if an account is 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.