Hello friend I am giving my personal experience about tubemate application after using it since last three years this is best youtube downloader for android you can get each and every video that was uploaded on youtube and you can download video in your required quality like 240p, 480p, 720p, 1080p and also you can download as mp3 audio file
You can not download this application from google playstore you can download from its official web tubemate.net