Apps similar to Responsively include MultiGlancer, which is free and open source. Other options are Polypane, Sizzy, Blisk and Solis. In total there are eight Web Debuggers like Responsively for Mac, Windows, Linux and the web.
MultiGlancer is a minimalist and open-source tool I've developed to streamline the web development process. It allows developers to view their site on multiple web sizes simultaneously on a single screen. Born out of necessity while perfecting my landing page for ArcanePad.
Polypane is a browser built from the ground up to create websites and apps. Polypane is the only browser that lets you develop a website for all viewports and devices at once, and gives you the best overview of them.
Netherlands
EU
Blisk is a browser for web developers, QA engineers, and web designers with built-in mobiles, tablets, laptops, and desktops. It provides teams and freelancers with a workspace to develop and test modern web applications twice faster.
Ukraine
Solis is a Live Design Output that integrates seamlessly with your favourite code editor to deliver real time, multi viewport previewing of HTML, CSS, SASS and LESS as you write it.
United Kingdom
A Chrome extension that overlays real phone and tablet frames over any live website, so you see the desktop and mobile layout side by side at the same time.
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...
Responsinator helps website makers quickly get an indication of how their responsive site will look on the most popular devices.
