Live Viewport & Device Testing
Test any website across real mobile, tablet, and desktop viewports simultaneously. Rotate orientations, zoom layouts, inspect elements, and spot responsive breakpoints instantly.
14+ Device Viewport Presets
Test across iPhone 16 Pro, Samsung Galaxy S24, Pixel 8, iPad Pro 12.9", MacBook Air, 1080p, 2K, and 4K displays with accurate resolution aspect ratios.
Side-by-Side Comparison
Compare Mobile, Tablet, and Desktop screen renders concurrently in a multi-device comparison grid to find layout shift bugs fast.
Orientation & Zoom Controls
Toggle portrait and landscape orientation with one click, or use scaling controls (25% to 150%) to fit high-resolution screens cleanly.
Solving Common Mobile Viewport & Speed Issues
My Website Looks Perfect on Desktop but Terrible on Mobile — What Went Wrong?
Step-by-step fix for viewport meta errors, unintended horizontal scrolling, cramped touch targets, and media query overflows.
My Website Loads Fast on My Laptop but Slowly on My Phone — Why?
Understand mobile CPU throttling, 4G latency delays, heavy JavaScript hydration, and uncompressed mobile assets.
Need a Full Speed & SEO Audit for Your Website?
Run an automated audit covering performance vitals, security headers, accessibility, design UX, and AI search visibility.