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Polypane vs Responsively App: catalog facts
Polypane	Responsively App
Paid A paid subscription is required after the trial.	Free The open-source application is available without a license fee.
Windows, macOS, Linux, Browser extension	Windows, macOS, Linux
Accessibility simulation and checks built into the browser itself Synchronised panes with live CSS editing across all of them	Interactions mirror across every viewport at once Screenshots every device size in a single action
Paid subscription with no free tier beyond a trial Chromium rendering only	Electron application with a large memory footprint Rendering is Chromium only, so it says nothing about Firefox or Safari
Downloadable app, Browser extension	Downloadable app
Closed source	Open source
License not stated	License: AGPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.