Downie is the only video download for OS X you will ever need. It isn't just a YouTube downloader: Downie supports at this moment over 650 different sites!
• Supports many sites - currently supports over 1000 different sites (including YouTube, Vimeo, etc.) and the number is rapidly growing.
• 4K video YouTube support - unlike many other YouTube downloaders, Downie supports HD video on YouTube, up to 4K.
• Postprocessing - need your video in MP4 for iTunes? Or want just the audio track? No problem, Downie can handle this for you automatically!
Quick support - I respond to emails usually within 24 hours and often add support for requested sites in the next update.
Frequent updates - An update every week!
Unlike other downloaders, Downie allows you to select the download quality not just for YouTube but wherever possible as well. It can automatically convert the videos to MP4, or just extract the audio track.
In case you run into a page that isn't supported, there's a Support button right in the main window, so you can report the link and support for it is likely to be added in the next version - and that's not too far away, since we update Downie at least once a week!