WOW! It's very fantastic.

Very useful for responsive website testing.

Does exactly what it claim. Highly recommend for responsive design testing.

Perfect extension. Have a small problem in mockups. When mockup mode on, it goes to dark mode. no way to disable dark mode when mockups on. Fix it immediately. Thanks.

Ca ne marche pas du tout.. le user agent n'est même pas modifié alors que c'est la base d'un simulateur mobile..

Best tool for website responsiveness testing

It's become an essential tool in my development process, especially when preparing my sites for launch. A great addition for any web developer or designer.

Additionally, while it covers the basics of popular devices, some less common screen sizes or customizable options would be a helpful feature. Nevertheless, it’s still a reliable tool for a quick check on your site’s responsiveness.

I appreciate the wide variety of device sizes available, and it’s helped me deliver more polished websites to clients. Highly recommended for mobile optimization!

This extension is great for anyone needing quick viewport tests. It’s super easy to use, and it quickly generates multiple device views, which helps me spot issues on different screen sizes

Multiple Viewport Simulator makes it effortless. It allows me to simulate multiple screen sizes side by side, and I can instantly see how my designs perform across phones, tablets, and desktops.

It’s incredibly accurate and quick to load, so you can test layouts, images, and other elements without switching between devices or emulators