Retina.js is an open source script that makes it easy to serve high-resolution images to devices with retina displays.
http://retinajs.com/
JavaScript Libraries and Functions · Media
Get access to data on 1,893,202 websites that are Retina JS Customers. We know of 610,821 live websites using Retina JS and an additional 1,282,381 sites that used Retina JS historically and 296,300 websites in the United States.
Get a list of 1,893,202 websites using Retina JS which includes location information, hosting data, contact details, 610,821 currently live websites and an additional 278,879 domains that redirect to sites in this list. 1,282,381 sites that used this technology previously and 296,300 websites in the United States currently using Retina JS.