The best alternatives to I Love Adaptive are Responsive Viewer, Pastel, and Serfo. If these 3 options don't work for you, we've listed a few more alternatives below.
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A Chrome extension to show multiple screens in one view. the extension will help front-end developers to test multiple screens while developing responsive websites/applications.
Design is not some magical pixie dust which you can sprinkle over as an after thought and expect magical things to happen automatically.
Design is a thought process and set of skills and capabilities within an organisation. Good Design is Good Business