- A specialized desktop browser built for web developers that displays websites simultaneously across multiple synchronized viewport sizes in a multi-pane layout, enabling efficient responsive design testing. The browser includes built-in tools for accessibility auditing, SEO testing, metadata previews, live reloading, and other development features that would typically require multiple browser extensions. Polypane was first released in 2019 by Kilian Valkhof. ↑ polypane.app
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