Screen Simulator
Test the responsiveness at the exact Mobile breakpoints.
Note: Sites that have security headers (X-Frame-Options) will not allow display within simulator iframes.
Focusing on Mobile-First
Nowadays, about 70 to 80% of web traffic comes from mobile devices. A page that looks good only on a computer's landscape screen will be abandoned if all the text is broken on a cell phone's vertical screen. The simulator uses a controlled iframe to draw exactly the popular proportions (such as 375x812px), allowing you to audit the mobile design without leaving your chair.