Hacker News Reader

Hacki is also nice, and looks like it works on both Android and iOS.

I tried this one out the other day but it felt very non-native - similar to other Flutter apps I've tried.

I like HACK on iOS

Oh yeah good point, I didn't realise it was not available for iOS as I don't use that. But I'm sure iOS has other good clients as people say, especially because this site is very US-developer centric which is an iOS stronghold in terms of marketshare :)