I like Pinboard, so I am always finding nice Pinbaord apps.
Pinbox looks beautiful with a flat UI, it shows you all bookmarks on the list. I use Delibar before, it event can't filter by tag. Some times I want see bookmarks only under a tag, Pinbox can show you a tag list and you can even filter by muti-tags. If you are a developer, Pinbox know you. Pinbox will show github repo info on the list board.
It's a great app!