App that let me download netflix, youtube or likewise with the highest qualty?

For downloading videos from YouTube or other sites, if you're using Safari and have ClickToFlash installed, right-click on the video and select "Download Video".

You can also use ClipGrab or KeepVid or similar apps or sites such as file2hd.com (for downloading any file types from a site).

To download via Safari 5:

While viewing the video just click "Window > Activity" then identify the video in the list of elements (it will likely show something like "258K of 1.8MB" and will be the largest file on the list.



Hold the option key down and double-click the file to download.​

There have been mixed reports about the availability of this functionality in Safari 6, using the Develop menu.

The quality of the downloaded file depends entirely on the quality of the video at the source.

 

I use SaveFrom.net. You can either use it online or they have an extension you can add to Safari that will embed a download button in the video source. Works well with YouTube, Vimeo, etc. Not sure it will work with Netflix, I suspect not.

 

The netflix DRM is likely to block any attempt to download. They don't want people renting movies then saving them to disk.

 

There's an addon for Firefox can't remember it's name as I've come away from Firefox

 

My first time using youtube downloader is MacX YouTube Downloader..it is free.

 

Read

https://www.netflix.com/TermsOfUse

and

http://guides.macrumors.com/Help:Forum_Rules