Is there an app that lets you login? I've seen some apps that are able to pull up results but saving them only works on that app. I'd like to be able to still upvote good posts I find.

You can log in through a phone browser. What are you even asking? o.oc

Think he's looking for a frontend app(let) that gives similar or the same functionality as the site itself.

I don't think I've seen anything like that before, but the guy seems positive it exists.

The site's functionality isn't very good for browsing stuff you search, it just displays loads of results. I'd like to be able to swipe through them instead of opening a bunch in multiple tabs or opening one and then going back.

There are apps that do that but they don't let you upvote or comment on anything.