Alternatives to Polypane

Multi-viewport browser with accessibility and performance tooling built in. The listings below can replace it for an important use case. Each note says what changes if you switch.

Replacements

Listings that take over the same core job as Polypane.

  • Responsively App

    Developer browser that renders many device viewports side by side.

    FreeOpen sourceWindowsmacOSLinux

    Responsively App is free and open source under AGPL-3.0, mirroring interactions across viewports, but it lacks Polypane's built-in accessibility simulation and uses more memory as an Electron app.

  • Sizzy

    Developer browser with synced device previews and project workspaces.

    PaidProprietaryWindowsmacOSLinux

    Sizzy is also a paid Chromium-based developer browser, adding project workspaces and isolated sessions per project rather than built-in accessibility and performance tooling.

  • Blisk

    Cross-device testing browser with hot reload and synced scrolling.

    FreemiumProprietaryWindowsmacOSLinux

    Blisk has a free tier with limited daily usage and adds hot reload plus screenshot and recording tools for bug reports, while remaining Chromium-only and closed source.

  • LT Browser

    A desktop browser for building, testing and debugging responsive websites across many device viewports side by side.

    FreemiumProprietaryWindowsmacOSLinux

    LT Browser is freemium, offers more than 50 device presets side by side and works with sites that block iframes, but is tied to a commercial testing platform.

Similar software

Related functionality, not a direct replacement.