We are measuring Perceived Performance of a website across all devices i.e Desktop, Different Mobiles & Tabs. Perceived Performance is what user feels about website speed instead of how long it took to fully load the website. It is what matters because we are optimizing for the users, not for some random metrics.
Just develop your website front-end only once using HTML, CSS & JavaScript for your favorite Browser. Thats it. Our software will convert your code compatible to all other Browsers (all IE versions, Safari, Firefox, Chrome ...).
