Polypane is a standalone Chromium-based browser built for developers: multiple synced viewports (scrolling, device/media-query emulation) side by side, 25+ debug tools, and 80+ built-in accessibility tests (WCAG compliance, color contrast, color blindness simulation).
14-day free trial, no card required. Individual: from $9/month. Business (up to 10 users): from $39/month.
Developers and designers who want to test responsive layouts and accessibility simultaneously across multiple device sizes, without manually resizing a single browser window repeatedly.
The built-in accessibility test suite (WCAG compliance, contrast, color blindness) is a genuine differentiator over a plain responsive-preview tool, worth using specifically during accessibility review passes, not merely responsive QA.
A browser for developing responsive & accessible websites.
