Mobile simulator - responsive testing tool

Tracking since Apr 5, 2026.

Changelog

• Jun 7, 2026
  description

  🚀 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.)

  🚀 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
  • 📱📱 Multi-device comparison: View and test multiple devices side-by-side simultaneously for faster responsive checks
  • 🛠️ 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.)

• May 24, 2026
  description

  Check the rendering on multiple devices, create impactful client demos, and save time in your testing.
  
  58 devices available (with new ones added regularly)
  📱 45 smartphones (old and recent)
  💻 5 tablet models
  ⌚️ 11 special devices (smartwatches, kiosks, computers…)
  
  Main features
  🎬 One-click video capture (WEBM, GIF, MP4) for your demos and tutorials
  📸 Transparent PNG screenshots, perfect for emails or presentations
  🌚 Dark mode for enhanced visual comfort
  
  Also included
  ➡️ Free downloadable transparent device mockups
  ➡️ Option to switch to landscape mode
  ➡️ Zoom just like on a real mobile
  ➡️ More than 10 customization options (PWA mode, fullscreen, native keyboard, etc.)
  ➡️ User gesture for touch scrolling
  
  Mobile FIRST has been the most powerful and reliable simulation extension for over 5 years.
  Our rating on the Chrome Store speaks for itself.
  
  ✨ It integrates many technical tricks to reproduce the mobile experience as closely as possible.
  Of course, this does not replace testing on a real device at the end of your development for full validation.

  🚀 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.)

• May 7, 2026
  description

  Check the rendering on multiple devices, create impactful client demos, and save time in your testing.
  
  58 devices available (with new ones added regularly)
  📱 45 smartphones (old and recent)
  💻 5 tablet models
  ⌚️ 11 special devices (smartwatches, kiosks, computers…)
  
  Main features
  🎬 One-click video capture (WEBM, GIF, MP4) for your demos and tutorials
  📸 Transparent PNG screenshots, perfect for emails or presentations
  🌚 Dark mode for enhanced visual comfort
  
  Also included
  ➡️ Free downloadable transparent device mockups
  ➡️ Option to switch to landscape mode
  ➡️ Zoom just like on a real mobile
  ➡️ More than 10 customization options (PWA mode, fullscreen, native keyboard, etc.)
  
  Mobile FIRST has been the most powerful and reliable simulation extension for over 5 years.
  Our rating on the Chrome Store speaks for itself.
  
  ✨ It integrates many technical tricks to reproduce the mobile experience as closely as possible.
  Of course, this does not replace testing on a real device at the end of your development for full validation.

  Check the rendering on multiple devices, create impactful client demos, and save time in your testing.
  
  58 devices available (with new ones added regularly)
  📱 45 smartphones (old and recent)
  💻 5 tablet models
  ⌚️ 11 special devices (smartwatches, kiosks, computers…)
  
  Main features
  🎬 One-click video capture (WEBM, GIF, MP4) for your demos and tutorials
  📸 Transparent PNG screenshots, perfect for emails or presentations
  🌚 Dark mode for enhanced visual comfort
  
  Also included
  ➡️ Free downloadable transparent device mockups
  ➡️ Option to switch to landscape mode
  ➡️ Zoom just like on a real mobile
  ➡️ More than 10 customization options (PWA mode, fullscreen, native keyboard, etc.)
  ➡️ User gesture for touch scrolling
  
  Mobile FIRST has been the most powerful and reliable simulation extension for over 5 years.
  Our rating on the Chrome Store speaks for itself.
  
  ✨ It integrates many technical tricks to reproduce the mobile experience as closely as possible.
  Of course, this does not replace testing on a real device at the end of your development for full validation.

Permissions & access

Permissions

webRequestscriptingtabsactiveTabdeclarativeNetRequestwebNavigationstoragecontextMenustabCaptureoffscreencommands

Host access

<all_urls>, *://*/*

Screenshots

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