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responsively-org/responsively-app

An Electron-based desktop browser for testing websites across many device previews at once, with mirrored interactions and an MCP server for AI agents.

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What is it?

Responsively App is a desktop browser built with Electron for responsive web development. It displays a site across many device viewports side by side, so developers can check how a layout behaves on different screen sizes without switching between tools.

User interactions such as scrolling, clicking and typing are mirrored across all device previews, and the app includes an element inspector that works across every preview. It ships with 30+ built-in device profiles, supports custom devices, can take screenshots of all previews at once, and supports hot reloading for developers.

The app is available for Mac, Windows and Linux, with a companion browser extension for Chrome, Firefox and Edge that sends links to the app. It also provides a built-in MCP server so AI coding agents such as Claude Code and Cursor can load pages, switch devices, interact with them and capture per-device screenshots.

Key features

  • 01Mirrors user interactions such as clicks and typing across all device previews.
  • 02Provides 30+ built-in device profiles and supports adding custom devices.
  • 03Offers an element inspector that works across every preview.
  • 04Takes one-click screenshots of all devices at once.
  • 05Supports hot reloading for development servers.
  • 06Includes an MCP server for AI coding agents to drive the app.

Use cases

  • Checking how a website's layout renders across phones, tablets and desktops during front-end development.
  • Reviewing responsive designs with per-device screenshots before release.
  • Letting an AI coding agent load a page and visually verify its responsive layout.

Quick start

  1. 1

    Install on macOS with Homebrew

    brew install --cask responsively
  2. 2

    Install on Windows with Chocolatey

    choco install responsively
  3. 3

    Or download the app from responsively.app or the releases page

Things to know

  • Desktop app only, with installers for Mac, Windows and Linux.
  • Licensed under AGPL-3.0, a strong copyleft license that requires sharing modified source code.

Topics

#responsive-design#electron#web-development#browser-testing#desktop-app#mcp#contributions-welcome#developer-tools#good-first-issue#hacktoberfest

FAQ

What is responsively-app?
An Electron-based desktop browser for testing websites across many device previews at once, with mirrored interactions and an MCP server for AI agents. Responsively App is a desktop browser built with Electron for responsive web development. It displays a site across many device viewports side by side, so developers can check how a layout behaves on different screen sizes without switching between tools.
Is responsively-app free to use? What license does it have?
responsively-app is open source under the AGPL-3.0 license. Check the license terms before using it in commercial products.
Is responsively-app still maintained?
Actively maintained. The last commit to responsively-app was on Oct 3, 2026.
What can I use responsively-app for?
Checking how a website's layout renders across phones, tablets and desktops during front-end development. Reviewing responsive designs with per-device screenshots before release. Letting an AI coding agent load a page and visually verify its responsive layout.
How do I install responsively-app?
Install on macOS with Homebrew: brew install --cask responsively Install on Windows with Chocolatey: choco install responsively Or download the app from responsively.app or the releases page
Where can I get responsively-app?
The source code and installation instructions are on GitHub: https://github.com/responsively-org/responsively-app

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