I am using tubemate for a long time.I think this is the best youtube downloader app for smartphone user.There are some copy software available but the actual tubemate software is working properly.You can search in the app or you can easily copy url and paste here to download anything from youtube.There are option for video quality among them you can choose your desired quality and download.It can use in 2g network also.I suggest this app for those who doesn’t have desktop or pc in their home but have a smartphone.