This app was mentioned in 3 comments, with an average of 1.33 upvotes
bummer... that's what i thought. well if op wants a quick and dirty app that might work well enough (but won't come close to the likes of sab/get even on android) This at least does what it says it does: https://play.google.com/store/apps/details?id=sic.nzb.app&hl=en
Just another vote for nzb leech - does exactly what you're asking