This is a very good app for download videos from you tube inn mobile.The size of this app was about 5 mb.The user interface of this app was very simple.when you open this app it goes straight to youtube.when you click on a video you have to tap on green arrow which is pointing downwards.Than you have to select the resolution of that video.Which was from 144p to 4k resolution.Than tap on download button you video starting downloading.You can download video from 144p resolution to 4k resolution and you can also download this videos in audio format.I am using this app from a while and I never see any problem in it.In my opinion this is a very good app for downloading videos from youtube go and download it.
THANKS