Test Any Website on Realistic Mobile & Tablet Screens
Accurate CSS viewports, device pixel ratios, user-agent spoofing, and high-resolution transparent mockups for web developers & designers.
Faithful Device Frames
Every device includes transparent high-DPI bezels, notches, punch holes, and foldable hinges matching physical hardware.
Accurate CSS Viewports
Inspect viewport widths, heights, physical pixel ratios, and CSS media queries. Copy exact User-Agent strings in one click.
Transparent Mockup Downloads
Export and download high-resolution transparent PNG mockups ready for presentation decks, Figma, portfolios, and client previews.
Explore 77+ Simulated Viewports & Frames
View accurate CSS viewports, physical resolutions, user agents, and download free PNG mockups.
Get Responsive Viewer for Google Chrome
Test your websites directly in your browser with 1-click simulator toggling, instant orientation flipping, screenshot capture, screencast recording, and full media queries support.