[notadog]

I assume that he means one of the many Hacker News clients available for iOS such as MiniHack [1] or Simple Reader for Hacker News [2].

[1] https://itunes.apple.com/it/app/minihack-hacker-news-client/...

[2] https://itunes.apple.com/us/app/simple-reader-for-hacker-new...