Oh I see. Yeah Microsoft's authenticator app can do that, but they use it as a second factor. I don't know the details but I'd guess that it's not time-based but some kind of challenge.
Another option is Tumblr's "magic link", where they email you a link that logs you in. That's one of the few places I've seen something like that used as a single factor.
Comments
Oh I see. Yeah Microsoft's authenticator app can do that, but they use it as a second factor. I don't know the details but I'd guess that it's not time-based but some kind of challenge.
Another option is Tumblr's "magic link", where they email you a link that logs you in. That's one of the few places I've seen something like that used as a single factor.