AI-Powered Responsive Testing

Test Your Website Across Every Device in Seconds

Enter a URL and instantly preview your site on 16+ device viewports. Our AI analyzes the HTML and CSS for responsive issues and provides actionable fix suggestions.

Features

Everything you need for responsive perfection

From multi-device previews to AI-powered analysis, catch every layout issue before your users do.

Multi-Device Testing

Preview your website simultaneously on 16 device viewports including phones, tablets, desktops, and foldables.

AI Layout Analysis

OpenAI analyzes your page's HTML and CSS to detect responsive design issues at every viewport size.

Responsive Issue Detection

Automatically find horizontal overflow, fixed-width elements, missing viewport tags, and more.

Fix Suggestions

Get specific CSS code suggestions to fix each detected issue. Copy-paste solutions for rapid fixes.

16+ Device Viewports

iPhone SE to Desktop 2K, including Galaxy Fold, Surface Pro, iPad Pro, and more real-world devices.

Compliance Reports

Generate detailed responsive design reports with scores, issues, and recommendations for each viewport.

Simple, transparent pricing

Start free, upgrade when you need more.

Free

Try responsive testing on your site

Free
  • 3 tests/month
  • 16 device viewports
  • Basic issue detection
  • HTML analysis
  • AI fix suggestions
  • PDF reports
  • Priority support
  • Team collaboration

Starter

For freelancers and small projects

$19/month
  • 30 tests/month
  • 16 device viewports
  • Full issue detection
  • HTML + CSS analysis
  • AI fix suggestions
  • PDF reports
  • Priority support
  • Team collaboration
Most Popular

Pro

For developers and growing teams

$49/month
  • Unlimited tests
  • 16 device viewports
  • Full issue detection
  • HTML + CSS deep analysis
  • AI fix suggestions with code
  • PDF & HTML reports
  • Priority support
  • Team collaboration

Agency

For agencies managing client sites

$99/month
  • Unlimited tests
  • 16 device viewports
  • Full issue detection
  • HTML + CSS deep analysis
  • AI fix suggestions with code
  • White-label PDF reports
  • Priority support
  • Team collaboration

Frequently Asked Questions

How does the responsive testing work?
Enter any URL and we render it in iframes at 16 different viewport sizes. Our AI then fetches and analyzes the page's HTML and CSS to identify responsive design issues at each viewport.
What devices are included in the test?
We test across 16 viewports: iPhone SE, iPhone 14, iPhone 14 Pro Max, Samsung Galaxy S23, Pixel 7, iPad Mini, iPad Pro 11, iPad Pro 12.9, Surface Pro, Laptop, MacBook Air, Desktop HD, Desktop 2K, Nest Hub, and Galaxy Fold (both closed and open).
What kind of issues does it detect?
Our AI detects missing viewport meta tags, lack of media queries, fixed-width elements, horizontal overflow risks, non-responsive images, rigid font sizes (px instead of rem/em), undersized touch targets, and more.
Does it actually render the page or just analyze HTML?
Both! We render your page in real iframes at each device viewport so you can visually inspect it. Simultaneously, the AI performs server-side HTML and CSS analysis for automated issue detection.
Can I test password-protected or localhost pages?
Currently we can only test publicly accessible URLs. Localhost and authenticated pages are not supported in the MVP. We plan to add tunnel-based local testing in a future release.
How are the fix suggestions generated?
Our AI analyzes the specific responsive issues found and generates targeted CSS fix suggestions. Each suggestion includes the element affected, the problem description, and copy-paste CSS code to resolve it.