Tool overview
Overview
Responsively is an open-source developer tool designed to make responsive web design fast, accurate, and effortless. Instead of manually resizing your browser or juggling multiple devices, Responsively lets you preview your website across a wide range of screen sizes in a single, synchronized view. As you interact with one viewport, all others mirror your actions in real time, helping you instantly spot layout issues, breakpoints, and cross-device inconsistencies. Built for frontend engineers, UI developers, and product teams, Responsively supports custom device presets, network throttling, and powerful inspection tools so you can debug responsive layouts with confidence. It integrates smoothly into modern web development workflows, whether you’re building with React, Vue, Angular, or plain HTML/CSS. With
features
like hot reloading, device synchronization, and built-in performance insights, Responsively dramatically shortens feedback loops during development and code review. It is ideal for teams who care about pixel-perfect interfaces and accessible experiences on mobile, tablet, and desktop. Whether you’re polishing a marketing site, a SaaS dashboard, or a complex web app, Responsively helps you deliver consistent, high-quality designs that look and feel right on every screen.