I haven't really found any good apps for that. After implementing this: <a href="http://imgur.com/55D3mXH" rel="nofollow">http://imgur.com/55D3mXH</a> in an app of mine I found this guys way of implementing it: <a href="http://weiranzhang.com/blog/2013/3/hackers-a-hacker-news-app-for-iphone" rel="nofollow">http://weiranzhang.com/blog/2013/3/hackers-a-hacker-news-app...</a><p>I think his is quite a bit better in multiple aspects, primarily because you retain a full width view of the comment regardless of how many tiers deep you are.