📱 What is Responsively App?

Responsively App is an open-source tool designed for web developers to test responsive web design across multiple screen sizes simultaneously in a single window.

Instead of constantly resizing your browser or switching between device views in DevTools, Responsively App displays mobile, tablet, and desktop layouts side by side in real time.

🎯 Purpose

Responsively App helps developers:

• Test layouts on multiple devices at the same time
• Instantly detect broken UI or layout issues
• Reduce repetitive browser resizing
• Improve front-end development workflow

✨ Key Features

🔄 1. Mirrored Interactions

Scroll, click, or type in one screen —
all other screens sync automatically.

🖥 2. Multiple Devices in One Window

Simulate various device types, including:

• Mobile
• Tablet
• Laptop
• Desktop

🛠 3. Unified Inspector

Inspect elements across multiple viewports from a single panel, making CSS debugging easier and faster.

📸 4. Multi-Device Screenshot

Capture screenshots of all simulated devices at once — perfect for QA and reporting.

📐 5. Built-in Device Profiles

Includes popular preset devices such as:

• iPhone
• iPad
• Android devices
• Common desktop resolutions

⚙️ How It Works

Responsively App:

• Uses a Chromium-based rendering engine
• Simulates multiple viewports simultaneously
• Syncs user interactions across devices
• Emulates device DPR (Device Pixel Ratio)

👨‍💻 Who Is It For?

• Front-end developers (React / Next.js / Vue / Angular)
• CSS / Tailwind developers
• QA testers
• UX designers
• Anyone working with responsive web design regularly

🧠 In Short

Responsively App is a powerful open-source tool
that lets you test responsive websites across multiple devices simultaneously,
helping you build and debug UI faster and more efficiently.