Screenfly allows you to view your website on a variety of device screens and resolutions. Enter a URL and click on GO to get started. Screenfly can use a proxy server to mimic devices while you view your website. The proxy server mimics the user agent string of the devices you select, but not the behavior of those devices. On devices with densely pixelated screens, websites are often rendered using reference pixels instead of the traditional hardware pixel. Keep in mind that resolutions in Screenfly refer to the rendered resolution, and not necessarily the native resolution of the device you’re testing.