Mobile Simulator MSIM Responsive Viewer

Professional mobile device simulator with multiple views, extensive device library, and sync scrolling

Mobile Simulator MSIM helps you preview and debug responsive layouts across phones and tablets without leaving Chrome. Open several device frames at once, compare breakpoints side by side, and catch layout issues earlier in your workflow. What you can do • Multi-view mode — show 2, 3, or 4 devices together so you can check your responsive grid in one glance. • Sync scroll — scroll one preview and keep the others aligned for faster side-by-side comparison. • Device frames — realistic phone and tablet frames, including notches, for a clearer sense of how the page looks on real hardware. • Rotation — switch between portrait and landscape in one click. • Custom viewports — set any width and height when a preset is not enough. • Quick action sets — start from handy bundles such as a popular 3-pack or an iOS set. • GEO Checker — from Quick Actions, open a URL to see what ChatGPT knows about your site and where visibility can improve. Device presets cover popular iPhones, iPads, Samsung Galaxy, Google Pixel, and other common Android phones and tablets. Built for developers and designers who want a more visual multi-device check than single-viewport DevTools.