Yes, there is. I've tried a few of them and HN Materialistic is the superb one: https://play.google.com/store/apps/details?id=io.github.hidr...

Materialistic is what I use, considering most of my Web browsing is done through the apps.

It's has login, vote and save(I guess it saves articles locally)

The con is that it has not been updated in a long time.

It's available on fdroid

Github.com/premii – I'm writing from it.

I use Hews, tried Materialistic but still prefer layout of Hews and I can change font face to Serif.