Main Features:

Playlists and channels
The program supports downloading of all videos of a playlist or a channel. And there’s also an option to track the selected channel or playlist and download new clips as they are uploaded.

Add to iTunes
You can configure the program to automatically add downloaded movies to your iTunes library. You can also pick a playlist to add them.

HQ, HD or 4K
The program supports all available resolutions, be that 720p, 1080p or 4K. The choice is up to you.

Monitor the clipboard
The program keeps an eye on the clipboard and as soon as it spots a supported link there, it automatically adds this video into the download queue.

Quality of the original
You can choose to save videos in the original quality (usually in MP4 format), without any modifications. In this case, the clip you get is exactly the same as the one its author uploaded.
Simple tag editor
The app automatically detects the artist and the title of a video and saves them to the downloaded file. And you can easily change them later.

Not just YouTube
The program supports Vevo.com, Vimeo, Dailymotion, Facebook, VKontakte, SoundCloud and a lot of other sites. So you can download video from these websites as easy as you do from YouTube.

Drag & Drop
The app features a 100% drag&drop support. Just drag the link to a video with your mouse and drop it to the main window of the program, or to its dock icon on Mac.

Multi-language interface
The app is translated into: Arabic, Azerbaijani, Chinese (Taiwan), Croatian, Czech, Danish, Dutch, English, French, German, Greek, Hungarian, Indonesian, Italian, Japanese, Korean, Latvian, Malay, Norwegian Bokmål, Polish, Portuguese, Portuguese (Brazil), Romanian, Russian, Spanish, Swedish, Turkish, Vietnamese.

Requires:

macOS 10.12 (Sierra), Mac OS X 10.11 (El Capitan), Mac OS X 10.10 (Yosemite), Mac OS X 10.9 (Mavericks), Mac OS X 10.8 (Mountain Lion), Mac OS X 10.7 (Lion), Mac OS X 10.6 (Snow Leopard)

Home Page - http://www.mediahuman.com/youtube-downloader/