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Mobile Simulator MSIM
Side-by-side mobile testing in Chrome & Firefox
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.
Hey Product Hunt 👋
I am launching Mobile Simulator (MSIM): a free Chrome and Firefox extension for multi-device responsive testing.
The pain: DevTools is great for one viewport. Real QA is comparing phones and tablets together, catching layout bugs, and showing clients something that looks like a real device, not a resized window.
What you get:
• Open multiple devices side by side
• Sync scrolling across previews
• One-click rotate
• Large device library with current flagships (iPhone 17 / 17 Pro / Air, Galaxy S25, Pixel 9, modern iPads)
• Custom width/height when you need a weird breakpoint
• Free core, no account required
Fresh in this version:
1) Updated device library for newest phones/tablets
2) Firefox desktop build live on AMO
3) Brand site at https://msim.app with direct install links
Install:
• Site: https://msim.app
• Chrome: https://chromewebstore.google.co...
• Firefox: https://addons.mozilla.org/en-US...
What it is not: a real-device cloud lab (BrowserStack-class). It is a fast in-browser multi-device preview for frontend and design QA.
I would love feedback from people who do responsive work daily:
• Which devices should be in the default “Popular” set?
• Any sync/scroll edge cases on your stack?
• Firefox workflow gaps vs Chrome?
Thanks for trying it. I will be here all day answering comments.
About Mobile Simulator MSIM on Product Hunt
“Side-by-side mobile testing in Chrome & Firefox”
Mobile Simulator MSIM was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #160 on the daily leaderboard. 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.
On the analytics side, Mobile Simulator MSIM competes within Browser Extensions, Chrome Extensions and Developer Tools — topics that collectively have 574.5k followers on Product Hunt. The dashboard above tracks how Mobile Simulator MSIM performed against the three products that launched closest to it on the same day.
Who hunted Mobile Simulator MSIM?
Mobile Simulator MSIM was hunted by Jack Malinowski. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Mobile Simulator MSIM including community comment highlights and product details, visit the product overview.
Jack Malinowski