Sites and apps similar to Screenfly include Responsa, which is free and open source. Other options are Resizer, by Google and ScreenSize.net. In total there are three sites and apps like Screenfly for self-hosting.
Responsa is an responsive design tool for testing how designs will look across multiple browsers. The open-source tool is freely available online, with the code being accessible for those seeking a self-hosted solution as well.
An interactive viewer to see and test how digital products respond to material design breakpoints across desktop, mobile and tablet.
ScreenSize.net is a lightweight, zero-clutter web utility designed to streamline the responsive design process. Whether you are a front-end developer building layouts or a UI/UX designer verifying breakpoints, this tool provides instant, accurate data on screen resolutions, CSS...
