By posting in Ask HN, I'll assume community discussion is important to you. So I'd recommend my app, Pivit. Besides having a great threading system (with ability to copy), it was designed for iOS 7 and utilizes:

・Dynamic Type

・Content deference

・Background Fetch

It has a one-of-a kind article indicator for both posts you've read and ones you've decided not to read, and support for opening in Safari and saving to your Reading List.

I also didn't overdo the HN orange.

Pivit — http://appsto.re/i6xC4GD

Right now I'm using http://ihackernews.com/ and setting a bookmark for it on my iDevices.

The bookmark icon is very clean and I get all of the functionality of HackerNews.

I've tried a bunch of free apps (not going to pay to read free HN) but was disappointed with all of them. Either they don't look very good or the ones that do, don't refresh to show previous posts so all you get are the first page of highest ranked or first pages of newest posts.

Mert Dumenci and I a few days ago release our iOS 7 Hacker News client, Hack Later. It's focused on reading articles quickly and saving them for later, and so is fairly minimal and extremely lightweight and fast. You can check it out on our site: http://BrushedType.co/ or the HN thread: https://news.ycombinator.com/item?id=6489349

Looks great, but an important note relevant to OP's question: "and includes no support for comments. Read, save, refresh."

MiniHack

See also user minihack's comment here: https://news.ycombinator.com/item?id=6489349

Minihack works well, although the hit areas get a little wonky sometimes.

I'm using Hackerful, great & full UI.

https://itunes.apple.com/us/app/hackerful-ycombinators-hacke...

I really like http://hn.premii.com. It's not a native app, but it works so well it feels like one.

This is really slick. Had I known about this, I might not have built one! But background fetch in my client feeds my addiction.