Cognition is a lovely Hacker News reader built native to iOS. Now available on the App Store. Totally for free.
If you want to hack on Cognition:
git clone https://github.com/skyefreeman/Cognition.git cd Cognition pod install open Cognition.xcworkspace
Head on over to the issue tracker to file or address an issue, feature request, or if you just want to give me a thumbs up. Pull requests are welcome and invited.
Cognition is available under the MIT License