#6565th of 111 in MCP servers for developers
responsively-app
Desktop browser that previews a page on many device sizes at once
- Stars
- 25.5k
- License
- AGPL-3.0
- Last commit
- Oct 2026
- Last release
- Feb 2026
- Language
- TypeScript
24,683 on 21 Apr 202625,540 on 10 Nov 2026
From GitHub's daily star counts.
Checked on GitHub.
Overview
Responsively App is an Electron-based browser for macOS, Windows and Linux that renders one URL across many device viewports with mirrored clicks and scrolling. It includes 30+ device profiles, a shared element inspector, and one-click screenshots. It also ships a built-in MCP server on 127.0.0.1:12720, so agents such as Claude Code and Cursor can navigate, click, type and capture per-device screenshots.
Who it is for: Web developers testing responsive layouts, including via AI coding agents
Strengths
- Interactions mirror across all device previews, with one inspector for every device
- MCP tools cover navigate, click, type_text, read_page and per-device screenshots
- Installs via brew, choco, winget, rpm or AppImage; browser extensions send links to it
- 30+ device profiles plus custom devices; hot reloading works with dev servers
Weaknesses
- AGPL-3.0 license may restrict use in some commercial or embedded settings
- MCP screenshots capture only the visible viewport, downscaled to at most 1000px wide
- MCP server needs the desktop app running; agent use launches a GUI
- MCP tool set is small: eight tools, no network or console inspection listed
What it needs
- Needs Node.js (npx) for the MCP launcher
- port 12720
Quick answers
Is responsively-app open source?
Yes. Its code is on GitHub under the AGPL-3.0 license.
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