Responsively App
A free, open-source browser for previewing and testing responsive web layouts across many devices at once.
Alternatives
Choose Polypane if…
- you need built‑in color‑contrast and other accessibility
- you want every pane to reload automatically on code changes
- you prefer a single browser that bundles common dev
- you can budget for a freemium tool with a paid tier for
Choose CodeSandbox if…
- you need a cloud IDE with zero local setup
- you want built‑in GitHub import and push
- you need real‑time collaboration with cursors and chat
- you need to run simple backend code alongside the frontend
How to Decide
Responsively App is a free, open‑source desktop browser that lets frontend developers and designers preview responsive web layouts across many devices at once. The alternatives split into a few clear camps: CodeSandbox leans into a cloud‑based instant IDE with real‑time collaboration and GitHub integration; Polypane emphasizes a Chromium desktop browser that shows every breakpoint simultaneously while running built‑in accessibility checks.
When choosing a replacement, focus on deployment model (desktop app versus cloud/SaaS), collaboration capabilities (real‑time co‑editing and sharing), built‑in accessibility testing, and open‑source versus proprietary licensing, as these are the dimensions where Responsively App, CodeSandbox, and Polypane actually differ.
All Alternatives
“Polypane is a dev‑focused Chromium browser that shows all breakpoints side‑by‑side with synced interactions, just like Responsively.”
“BrowserStack lets developers test sites on multiple real device viewports simultaneously, serving the same responsive‑testing need.”
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