Responsive Checker - Mobile Simulator Pro

About

Smartphone and tablet simulator on your computer with 55+ device models to check how your website looks on mobile in seconds.

🚀 Verify your responsive design, preview your site the way visitors see it, create client-ready previews, and save hours of manual testing. A fast, lightweight testing tool built for developers, designers, and agencies — with zero data collection.

📱 55+ PRE-CONFIGURED DEVICES
- Modern and older smartphones with accurate viewport sizes
- Popular tablets in multiple screen sizes
- Special profiles: smartwatch, laptop, desktop, kiosk, and foldable

🔥 MAIN FEATURES
- Multi-device comparison — view up to 6 devices side-by-side simultaneously, so you can spot breakpoint issues without switching between viewports
- Custom devices — create and save your own screen resolutions for any project requirement
- Accurate viewports — every preset uses real CSS viewport dimensions and device pixel ratios
- One-click screenshots — capture device previews as PNG, saved straight to your Downloads folder
- Instant rotation — flip every open device between portrait and landscape with a single click
- Smart zoom — scale the workspace from 30% to 150% to fit more devices on screen
- Light theme by default, with an optional dark mode

🎁 ALSO INCLUDED
- Realistic device frames with notch, island, and punch-hole rendering
- Reload all devices at once
- Your settings and custom devices are remembered between sessions
- Works on any website — just enter a URL

⚡ WHY USERS CHOOSE THIS EXTENSION
- 100% free — no account, no sign-up, no limits
- Zero data collection — everything runs locally in your browser
- Lightweight — no background processes slowing Chrome down
- Search engines rank mobile-friendly sites higher. Check your pages before every launch and catch layout issues before your visitors do.

🔒 PRIVACY FIRST
This extension collects no data whatsoever. No analytics, no tracking, no external servers. Your URLs, screenshots, and settings never leave your device.

(Note: A simulator reproduces mobile viewports with high accuracy for day-to-day development, but does not replace final validation on a real physical device.)