An essential tool to test the responsiveness of any website on multiple screens simultaneously
Users
6,000
0 in 30 days
Rating
3.9 / 5
−0.13 in 30 days
Ratings
23
+1 in 30 days
Store rank
#13K
#11K among extensions
Version
1.0.2
updated 19 May 2026
Users
monthly, 2 years
Latest, 15 Oct 2026:6,000 usersMove the mouse over the chart for any month
Ratings count
monthly, 2 years
Latest, 15 Oct 2026:23 ratingsMove the mouse over the chart for any month
The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.
About Responsive Website Testing Toolkit - Multiple Viewport Simulator
Simplify your web development and testing journey with Responsive Website Testing Toolkit, a comprehensive solution built to enhance testing, collaboration, and project organization. An advanced multi-device responsiveness testing tool that empowers developers and designers to work smarter and faster.
Key Features:
1. Test Responsiveness Across Multiple Viewports Simultaneously
Instantly preview your website on multiple devices in real time. Responsive Website Testing Toolkit lets you view layouts on smartphones, tablets, desktops, and more, helping you deliver pixel-perfect designs for every screen size.
2. Sync Mouse Clicks and Scroll Events Across Viewports
Test interactivity like never before! Sync mouse clicks, and scroll events across all viewports simultaneously, ensuring a seamless user experience across devices.
3. Customizable Viewports for Every Need
Design and test for any screen size with ease. ResponsiveSync Pro allows you to create custom viewports tailored to unique device requirements, giving you the flexibility to tackle any project.
4. Workspaces for Efficient Project Management
Stay organized with dedicated workspaces for every project. Manage viewports, configurations in a single, user-friendly interface, making multi-project management a breeze.
5. Export and Import Projects and Settings
Seamlessly collaborate with your team or transfer projects between environments. Responsive Website Testing Toolkit supports exporting and importing projects and settings, ensuring continuity and productivity across your workflow.
6. Capture Screenshots Instantly
Document and share progress with one-click screenshot capabilities with or without the device Mockup.
Besides above mentioned key features there are more features to explore. We are actively working to introduce new features in a regular interval and improve the quality of the application.
Why Choose Responsive Website Testing Toolkit?
✅ Save Time: Simultaneous multi-device testing accelerates your workflow.
✅ Work Smart: Advanced features like synced actions and project exports boost efficiency.
✅ Be Flexible: Customize viewports and configurations to fit any requirement.
✅ Stay Organized: Streamline project management with intuitive workspaces.
Take your responsive web development and testing to the next level with Responsive Website Testing Toolkit, the all-in-one tool that delivers precision, flexibility, and convenience.
For any suggestions or feature request please reach out to us via the email which mentioned in the developer info.
Privacy Policy: https://rbrahul.github.io/privacy/responsiveness-webkit/
Growth
Window
Users
Change
Ratings
Rating
7 days
0
+0.0%
0
0.00
30 days
0
+0.0%
+1
−0.13
6 months
+1,000
+20.0%
+4
−0.08
1 year
+3,000
+100.0%
+7
+0.12
Chrome Web Store search rankings
Where Responsive Website Testing Toolkit - Multiple Viewport Simulator appears when people search the store, with the 30 day change