The app is called ibamorz anime downloaded, and it's an incredible convenient app. It let's you both watch and download a ton of different anime.
It downloads anime extremely fast and you can easily put them into a 'download list' so unlike Anime TV you can download multiple anime. I give this app a 9/10 for awesomeness (it does have a few glitches)
You can get the app of the Google play store and the amazon appstore. (If its no longer on those appstores Google ibamorz anime downloaded and you should find it easily)