The best of all is Snapetube. In Snaptube, you can coverts the video to audio or another video format in seconds. It also displays the downloading speed. You can download any type of video from any website along with youtube.  

Looking to Download YouTube videos?

Many people find difficulties in downloading YouTube videos because it does not offer downloading feature.
The best Application to download videos from YouTube is VIDEODER.
The best part of this Application is that apart from YouTube you can even download Videos from any Website.

What is the best Android app for downloading YouTube videos?