I made some posts yesterday on Reddit about PhrasePump, spammed it all over. /r/German liked it (https://www.reddit.com/r/German/comments/yh4svg/we_made_a_thing_it_teaches_you_words_through/).
Anyway, I wrote in the post, ‘this doesn’t work on mobile, so don’t try!’. People still commented, ‘not working on my phone!’. Then Og decided that he could make PhrasePump useable on mobile, and it turned out to be not too hard. We’re still fixing some things up, but, you can review you cards on your phone if you go directly to the PhrasePump URL (Language Reactor). It works pretty well actually.
A lot of people had the third-party-cookies login issue, I think it happens more in Germany, will check this out next.