Mobile simulator - responsive testing tool

Smartphone and tablet simulator on computer with several models to test mobile responsive websites.

🚀 Simulate mobile viewports, check responsive web design, create impactful client demos, and save hours of testing. Mobile FIRST is the most powerful and reliable responsive simulator extension, trusted by developers and designers for over 5 years. Our rating on the Chrome Store speaks for itself! 📱 PRE-CONFIGURED DEVICES (New ones added regularly) • 58+ devices ready to use out of the box • 45 smartphones (old and recent models) • 5 tablet models • 11 special devices (smartwatches, kiosks, desktop...) 🔥 NEW & MAIN FEATURES • 🛠️ Custom devices: Create and save your own devices with custom screen resolutions and viewports • 👆 Realistic touch scrolling: Simulates native finger gestures for an authentic mobile browsing feel • 🎬 One-click video capture (WEBM, GIF, MP4) for your demos and tutorials • 📸 Transparent PNG screenshots, perfect for client emails or presentations • 🌚 Dark mode for enhanced visual comfort 🎁 ALSO INCLUDED • Free downloadable transparent device mockups • Seamless landscape mode switching • Realistic zoom mimicking actual mobile behavior • More than 10 customization options (PWA mode, fullscreen, native keyboard, etc.) ✨ Inside Mobile FIRST, many technical tricks are integrated to reproduce the mobile experience as closely as possible. (Note: While highly accurate for day-to-day dev, this simulator does not replace final testing on a real device for 100% full validation.)