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One Click Test - Tool for quickly testing your design layout in one click.
Responsive Viewer - View multiple screen dimensions in one view
XPRS - Free website builder - making web design like Lego™. No code
Responsive Website Test - Test any website on desktop, mobile, and tablet
Dimensions Toolkit - Chrome Extension for designers to test responsive websites.
LT Browser by Lambdatest - LT Browser is a free dev friendly browser for developers and testers. You can see mobile view of website on different screen sizes and resolution on 50+ pre installed view ports. You can build, test and debug your website faster then ever.