They use Web Authn, which is an open Web API : https://developer.mozilla.org/en-US/docs/Web/API/Web_Authentication_API https://developer.mozilla.org/en-US/docs/

They use Web Authn, which is an open Web API : https://developer.mozilla.org/en-US/docs/Web/API/Web_Authentication_API https://developer.mozilla.org/en-US/docs/Web/API/Web_Authent... Implementing a client with this also works on Android and any computer that supports some kind of hardware authentication mechanism, like fingerprint or face recognition.