Now you can easily download HD YouTube video on your android Device by this app.
Not only that you can download video from any site like Facebook e.t.c.
After installing this app you will directly connected with facebook.
when you will redirected to Youtube Page then you need to select/Tap a video for Download
After that you you will get a green Icon like the above picture.Click Tap on that Icon.
Now you will get a Picture like above.
as your wish you can now download/Play your video.
For other Site :
Just paste the Video Link into Menu>URL & Download.