Responsively - Test Your Website on Every Device at Once

Building responsive websites is hard. You design for desktop, check mobile, tweak tablet, and repeat endlessly. Responsively changes that by letting you see all devices at once - in real-time.

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Free & Open-Source

Test unlimited devices simultaneously with zero cost. Available for Windows, Mac, and Linux.

See All Devices at Once

Instead of resizing your browser or switching between device emulators, Responsively shows you phone, tablet, and desktop views side-by-side:

Responsively showing phone, tablet, and desktop views simultaneously

View Full Size

Responsively displaying a website on phone (390px), iPad (768px), and MacBook (1440px) simultaneously

Key Features

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Multi-Device Preview

View 30+ device profiles including iPhone, iPad, Android, and desktop screens - all at once

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Synchronized Interactions

Scroll, click, and type on one device - all others follow. Spot responsive bugs instantly

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DevTools Built-in

Inspect elements and debug CSS directly within the app - no context switching needed

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Screenshot Capture

Export screenshots of all devices for documentation, client presentations, or bug reports

Device Previews

Here's how a responsive website looks across different screen sizes:

iPhone 12 Pro

390 x 844

iPad

768 x 1024

MacBook Pro

1440 x 900

Why Developers Love It

✓ Save Hours of Testing Time - No more resizing browser windows or switching between emulators
✓ Catch Bugs Early - See layout issues across all breakpoints while you code
✓ Hot Reload Support - Works with your dev server for instant updates
✓ 100% Free - Open-source, no subscriptions, no feature limits
✓ Works Offline - No internet required after installation

Responsive Breakpoints Cheatsheet

Bookmark these standard breakpoints for your CSS media queries:

Breakpoint	Width	Devices	Tailwind
Mobile S	320px	iPhone SE, older phones	`default`
Mobile M	375px	iPhone 12/13/14	`default`
Mobile L	425px	iPhone Plus, large Android	`default`
Tablet	768px	iPad, tablets	`md:`
Laptop	1024px	Small laptops, iPad Pro	`lg:`
Desktop	1280px	Standard monitors	`xl:`
Large Desktop	1536px+	Large monitors, 4K displays	`2xl:`

Pre-Launch Testing Checklist

Before shipping, check these 10 common responsive issues across all breakpoints:

1
Navigation collapses properly Hamburger menu works, no horizontal overflow
2
Touch targets are 44px minimum Buttons/links are large enough to tap accurately
3
Font sizes are readable on mobile Body text at least 16px, no tiny labels
4
Images scale without breaking layout max-width: 100% on all images, proper aspect ratios
5
Forms are usable on small screens Inputs full-width, labels visible, keyboard-friendly
6
Modals/popups fit the viewport Scrollable content, close button accessible
7
Tables scroll horizontally or stack No content cut off, overflow-x-auto or responsive tables
8
No horizontal scrollbar on any page Check for elements wider than viewport
9
CTA buttons stay visible and prominent Primary actions don't get hidden or too small
10
Footer stacks properly on mobile Links readable, columns become rows

Pro Tips & Power Features

Level up your Responsively workflow with these lesser-known features:

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Keyboard Shortcuts

Cmd/Ctrl + R - Refresh all devices
Cmd/Ctrl + Shift + S - Screenshot all devices
Cmd/Ctrl + I - Toggle DevTools
Cmd/Ctrl + D - Add/remove device

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Custom Device Profiles

Click the "+" button to create custom device profiles. Perfect for client-specific devices or unusual screen sizes. Save profiles for quick access across projects.

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Bulk Screenshot Export

Capture all visible devices with one click. Great for design reviews, client presentations, or documenting responsive behavior. Export as PNG with device names.

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Network Throttling

Simulate slow connections (3G, 4G) to test loading states and performance on mobile networks. Find issues before real users do.

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Test with ngrok/localhost.run

Pair Responsively with a tunnel service to test on real devices. Run ngrok http 3000, paste the URL in Responsively, then open the same URL on your actual phone.

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Disable Sync for Specific Tests

Sometimes you need to test scroll position or hover states independently. Toggle sync off temporarily to interact with devices separately.

Getting Started

1

Download Responsively

Visit responsively.app and download for your OS (Windows, Mac, or Linux)
2

Enter Your URL

Paste your localhost or live site URL in the address bar
3

Select Devices

Choose which device profiles to preview from 30+ built-in options
4

Start Building

Code, save, and watch all devices update automatically with hot reload

Download Responsively for Free

Stop wrestling with responsive design. See every device at once and ship pixel-perfect websites faster.

Download Now