Company
About Mobile Simulator
Mobile Simulator is a free Chrome extension that helps people preview websites across multiple phones and tablets at once. The product brand lives at msim.app.
What we make
Frontend developers, freelancers, agencies, and marketing teams still waste time resizing a single browser window to guess how a layout will look on real devices. Mobile Simulator puts multiple device sizes on screen together, with frames, presets, custom sizes, and sync scrolling so issues show up before a client demo or production deploy.
The core multi-device experience is free forever and installs from the
Chrome Web Store
(extension ID peipdddkaeomnfdenmkddkapeemjomnb). No account is required for basic use.
What we are not
Mobile Simulator is not a remote device cloud, not a Selenium grid, and not a hosted browser API. It runs locally in Chrome. If you need real hardware farms or automated cross-browser CI, use a specialized cloud lab. MSIM is the fast local first step for responsive visual checks.
Brand and domain
Primary brand domain: https://msim.app. Marketing pages, privacy information, and agent-readable documentation are published here so humans and AI assistants can verify product facts without scraping the store alone.
Trust pages
Privacy note · Contact · Pricing (markdown) · llms.txt for agents