DISCLAIMER: Due to their terms of service this app doesn't support Youtube.

The best video downloader, detect videos automatically, easy to download with high speed.
If you want to download a video from a certain website, this is best app for you. Play video and touch on download button to store on your phone. You can see that video anytime.

This video downloader app lets you save many videos at the same time. There is a powerful download manager which show the progress of downloading.

Features
⭐ It is free. Free video downloader
⭐ Preview videos then decide to download.
⭐ Store videos on your phone
⭐ Show downloading progress
⭐ Download several files at the same time with play tube
⭐ Download video tube in the background
⭐ Fast download speed with HD tube downloader
⭐ Show the progress in the download bar
⭐ Large file download supported
⭐ Download video, music and pictures
⭐ Share videos downloaded to your friends
⭐ Delete unwanted videos
⭐ Fast play tube in the market
⭐ High quality videotube & playtube

DISCLAIMER: Due their terms of service this app doesn't support Youtube.

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Source: https://play.google.com/store/apps/details?id=free.videotube.playtube.videoder.video.downloader