Preview Your Website on Every Device

Instantly check how your website looks on mobile, tablet & desktop.

Lightning Fast Performance

Instant Responsive Design Testing

Experience real-time website previews across all devices with zero loading time.

Lightning Fast Performance

Zero Loading Time

Our advanced rendering engine delivers instant results across all device types. No waiting, no delays - just immediate responsive design feedback for your development workflow.

  • 0.2s Average Load Time
  • Real-time Preview Updates
  • Instant Device Switching
  • Live CSS Debugging
Comprehensive Device Library

50+ Device Presets

Test your responsive designs on an extensive library of real device dimensions. From the latest smartphones to ultra-wide monitors, ensure perfect compatibility everywhere.

  • Latest Mobile Devices
  • Tablet & Hybrid Screens
  • Desktop & Widescreen
  • Custom Viewport Sizes
Professional Workflow

Agile Development Ready

Perfect for modern development workflows and rapid prototyping. Integrate seamlessly with your existing tools and processes for maximum productivity.

  • CI/CD Integration
  • Screenshot Export
  • Team Collaboration
  • API Access Available

Test on Every Device Imaginable

From the latest iPhone to ultra-wide monitors, ensure your website looks perfect everywhere

Mobile Device Testing

Mobile First Design

Test responsive breakpoints on smartphones and tablets with pixel-perfect accuracy

Desktop Testing

Desktop & Widescreen

Validate layouts on large screens and ultra-wide monitors for professional presentations

Tablet Testing

Tablet Optimization

Perfect your designs for iPad, Android tablets, and hybrid devices

Developer Workflow

Seamless Developer Workflow

Integrate UiLooker into your development process with our streamlined three-step workflow

URL Input
01

Paste & Preview

Simply enter your website URL and watch as UiLooker instantly loads your site for comprehensive responsive testing

Device Selection
02

Select Devices

Choose from our extensive library of real device dimensions, or create custom viewport sizes for specific testing scenarios

Export Results
03

Export & Share

Capture high-quality screenshots, generate reports, and share results with your team or clients instantly

Trusted by Professionals Worldwide

From startups to enterprise teams, UiLooker powers responsive design workflows across the industry

Frontend Development

Frontend Development Teams

Streamline your CSS media query testing, validate responsive breakpoints, and ensure cross-browser compatibility with our comprehensive testing suite. Perfect for React, Vue, Angular, and vanilla JavaScript projects.

  • CSS Grid & Flexbox Testing
  • Media Query Validation
  • Cross-Browser Compatibility
  • Performance Optimization
UI/UX Design

UI/UX Design Studios

Validate your design concepts across all screen sizes, test user interface elements, and ensure consistent user experiences. Integrate seamlessly with Figma, Sketch, and Adobe XD workflows.

  • Design System Validation
  • User Experience Testing
  • Accessibility Compliance
  • Client Presentation Tools
Digital Agencies

Digital Agencies & Freelancers

Deliver professional client presentations with device mockups, generate comprehensive testing reports, and streamline your quality assurance process for faster project delivery.

  • Client Presentation Mode
  • Automated Report Generation
  • Team Collaboration Tools
  • White-Label Solutions