Marco Arment also did this a while back with either "The Magazine" or Overcast (I forget which one, only heard them discuss it on the Accidental Tech Podcast).

Marco Arment also did this a while back with either "The Magazine" or Overcast (I forget which one, only heard them discuss it on the Accidental Tech Podcast). No passwords at all. edit: found it, it was overcast https://marco.org/2012/07/31/passwordless-login https://marco.org/2012/07/31/passwordless-login https://overcast.fm/skeptics_faq https://overcast.fm/skeptics_faq