Responsively App

Name: Responsively App
Brand: Responsively App

A free, open-source browser for previewing and testing responsive web layouts across many devices at once.

softwareDeveloper ToolsResponsive DesignBrowser DevToolsOpen Source

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Our Verdict

Best for

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

Skip if

You need real cross-browser engine testing, not just viewport simulation.

What is Responsively App?

Responsively App is a free, open-source development browser built specifically for responsive web design work. It lets developers view multiple device viewports side by side, with clicks, scrolls, and form inputs performed on one device automatically mirrored across every other device shown, instead of manually resizing a single browser window. The app includes Preview Suits for saving and switching between favorite device combinations, a unified element inspector that works across all visible devices at once, and one-click batch screenshots of every device in view. It also bundles standard browser developer tools, including cookie, local storage, and session storage management.

SpecificationsAI-estimated

deploymentDesktop App

open source✅ Yes

Key Features of Responsively App

Displays multiple device viewports simultaneously so you can see how a layout responds across screen sizes at once.

Synchronizes interactions like clicks, scrolls, and form inputs across all visible device previews in real time.

Preview Suits let you save and quickly switch between favorite groups of device viewports.

Provides a unified element inspector that applies across every device shown at once.

Captures full-page screenshots of all displayed devices with a single click.

Comes preloaded with many device profiles and lets you add custom device sizes.

Use Cases for Responsively App

Responsive layout QA

Check how a page's layout behaves across phone, tablet, and desktop viewports at the same time.

Design review sessions

Walk a designer or stakeholder through how a page looks across devices in a single interactive session.

Batch device screenshots

Capture full-page screenshots of a page across all configured devices in one click for documentation or bug reports.

Cross-device debugging

Use the unified inspector to debug an element's styling issue as it appears across multiple device sizes.

Pros & Cons of Responsively App

Pros

Completely free and open source
Sees responsive layout across many devices without manual resizing
Synchronized interactions save time compared to testing each device separately
Includes standard devtools features like storage inspection alongside responsive testing

Cons

Desktop app only, not a browser extension for your existing browser
Smaller community and update cadence than Chrome or Firefox devtools
Doesn't replace full cross-browser engine testing (WebKit/Gecko differences)

Frequently Asked Questions

Is Responsively App free?

Yes, it's completely free and open source.

Which platforms does Responsively App run on?

It's a desktop app that supports keyboard shortcuts common to macOS and Windows workflows.

Can I add custom device sizes?

Yes, in addition to the built-in device profiles, you can add your own custom devices.

Does it include normal browser dev tools?

Yes, it bundles standard devtools features including cookie, local storage, and session storage management.

Pricing Overview

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Free

Detailed plans are not listed. Visit the official website for pricing information.

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