Responsive Tester Extension

Overview

Test website responsiveness across devices

The extension displays your website in the 50 most common screen resolutions today. Perfect for web developers and UX/UI professionals. The extension is free and ad-free.

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Details

Version
1.0
Updated
May 14, 2025
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Size
1.35MiB
Languages
English
Developer
Email
responsive.tester.s@gmail.com
Non-trader
This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.

Privacy

The developer has disclosed that it will not collect or use your data. To learn more, see the developer’s privacy policy.

This developer declares that your data is

Not being sold to third parties, outside of the approved use cases
Not being used or transferred for purposes that are unrelated to the item's core functionality
Not being used or transferred to determine creditworthiness or for lending purposes

Widescreen Browsing

4.8

Limit the width of webpages for a better widescreen experience

Responsive Website Testing Toolkit - Multiple Viewport Simulator

3.9

An essential tool to test the responsiveness of any website on multiple screens simultaneously

Phone Simulator — Mobile Emulator Tool

4.8

Mobile simulator in your browser 📱 — preview responsive sites on 30+ devices

Web Accessibility

5.0

Website Accessibility Testing Tool

Responsive Tester

3.2

Test responsive web designs or mobile pages and see if it is mobile friendly

Device Simulator & Tester

4.7

Test sites on multiple devices in one tab. Improve development, UI/UX, & QA with live previews.

Responsive Viewer

4.2

Show multiple screens once, Responsive design tester

U-Eyes: Mobile Simulator

4.5

Test any website on iPhone & Android mobile devices. A powerful mobile simulator with screenshots & beautiful device mockups.

Live CSS Tester

4.2

Easily inject CSS into a webpage for testing

Mobile View Tester: Responsive Web Design Tool

3.6

Mobile-first design validation. Quickly preview and optimize website performance across multiple device screen sizes.

SpeedVitals

4.6

Perform Web Vitals & TTFB Test on Multiple Locations & Devices

Viewport Resizer: Ultimate Device Emulator & Website Testing Tool

4.2

Emulate devices, resize screens, and perfect your web design effortlessly with this cutting-edge testing and presentation tool.