Blind let's you view your sites in 1X on a Retina display.
Are you a web developer with a Retina display? Do you want to see what your site looks like on a 1x display? Introducing Blind.
Run Blind concurrently with your normal browser to view your sites in 1x resolution. Safari has a 'low-resolution mode,' but it doesn't accurately represent what someone experiences on a 1X resolution display. Use Blind's bookmarklet in your normal browsers to quickly send the site you are working on to Blind.
Get comfortable with how your clients and others will view your work.