Alternatives to Responsively App
Developer browser that renders many device viewports side by side. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
Responsively App
Developer browser that renders many device viewports side by side.
Replacements
Listings that take over the same core job as Responsively App.
Polypane
Multi-viewport browser with accessibility and performance tooling built in.
Polypane adds built-in accessibility simulation and live CSS editing across synchronised panes, but it is a paid, closed-source subscription with only a trial.
Sizzy
Developer browser with synced device previews and project workspaces.
Sizzy adds project workspaces and isolated sessions per project, but it is a paid, closed-source subscription and still renders with Chromium only.
Blisk
Cross-device testing browser with hot reload and synced scrolling.
Blisk adds hot reload on file change and bug-report recording tools, but it is closed source and its free tier limits daily usage time.
LT Browser
A desktop browser for building, testing and debugging responsive websites across many device viewports side by side.
LT Browser shows more than 50 device presets side by side and handles sites that block iframes, but it is closed source and tied to a paid testing platform.
Similar software
Related functionality, not a direct replacement.
BrowserStack Live
A cloud service for testing websites by hand in real desktop and mobile browsers on real devices.
Chrome DevTools
The web developer tools built into Google Chrome for editing pages, debugging and profiling performance.
Firefox Developer Tools
The web developer tools built into Firefox for inspecting, editing and debugging HTML, CSS and JavaScript.
TestMu AI
A cloud testing platform, formerly LambdaTest, for cross-browser, automated and AI-assisted testing of web apps.
Eruda
Developer console that runs inside a mobile browser page.
