Polypane

A Chromium browser for developers that shows every breakpoint at once.

softwareDeveloper Toolsresponsive-testingaccessibility-testingdev-browser

Alternatives

Responsively App is a free, open-source development browser built specifically for responsive web design work.

✦ Best for frontend developers who want to preview and test a responsive layout across many devices at once, for free.

“Both are dev browsers that show multiple device viewports side‑by‑side for responsive testing.”

Unclaimed Listing

Platforms

Target AudienceFrontend developers and designers building responsive, accessible websites

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