With kouio I group together all the interesting subreddit feeds under a folder called Reddit - then I can view them individually or all together at once.
reddit's RSS features are even better than that. You can feed off users, searches, multireddits, comments on a specific post, submission from a domain, and probably more.
https://kouio.com/blog/kouio-your-mobile-rss-reader
You can also push articles out to a whole ton of services at once, including Evernote:
https://kouio.com/blog/sharing-is-caring
As for HN and Reddit, RSS is perfect for these - HN has its own RSS feed dedicated to front-page items:
https://news.ycombinator.com/rss
It gets even better with Reddit, each individual subreddit has its own RSS feed, eg:
http://www.reddit.com/r/systems/.rss
With kouio I group together all the interesting subreddit feeds under a folder called Reddit - then I can view them individually or all together at once.