Youtube is Youtube downloader app for android phone and is very simpe app to use. Videos can episode in any resolutions like 1280p, 720p, 480p, 360p, 180p 144p and audio M4A, Mp3, OGG.
Download speed is very good and it provides resumable links. Functions are very good like preferable path, number of download at same time, speed restrictions. Size of app is very low about 6 mb.
Main drawback of youtube is it consumes lot of battery and it requies additional video converter app for downloading highes resolution than 640×360.