Mobile Simulator MSIM
Side-by-side mobile testing in Chrome & Firefox
Mobile Simulator MSIM とは？
Free multi-device website preview for Chrome and Firefox. Open phones and tablets side by side, sync scroll, rotate, and catch responsive bugs faster than single-viewport DevTools. What's new: updated device library with current flagships (iPhone 17 / 17 Pro / Air, Galaxy S25, Pixel 9, modern iPads) and a fresh Firefox desktop build alongside Chrome. Free core, no account required. Install from msim.app.
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