Responsive Viewer
Compare a website at different viewport sizes in a single browser workspace.
What’s included for free?
Free-forever core responsive previews with advertising and a subset of screen options. Premium unlocks all screens/device mockups, no ads and screenshot annotations. Viewports do not replicate every real-device behaviour.
Provider information ↗Checked 2026-10-09
Before you use it
Published extension source is MIT: https://github.com/skmail/responsive-viewer. Hosted accounts and premium services have separate provider terms.
Provider terms can change. Check current pricing and usage rights before starting a project.