Compare: Responsive Viewer vs Mobile simulator - responsive testing tool

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Metric	Responsive Viewer	Mobile simulator - responsive testing tool
User count	300,000	1,000,000
Average rating	4.23	4.90
Rating count	348	4,974
Last updated	2026-03-24	Unknown
Size	0.79 MB	Unknown
Version	1.1.24	Unknown

Short description	Instantly preview multiple screen sizes in one Chrome view. Fast, privacy-friendly responsive testing for front-end developers. Open-source.	Smartphone and tablet simulator on computer with several models to test mobile responsive websites.
Full summary	Responsive Viewer lets front-end developers preview multiple screen sizes simultaneously inside Chrome. Quickly test responsive layouts, breakpoints, and UI across devices without switching tabs or manually resizing windows. The extension displays multiple screen frames in a single view so you can iterate faster while building responsive websites and web apps. Privacy-first and open-source: Responsive Viewer does not collect, store, or track any personal data. Source code is available on GitHub (https://github.com/skmail/responsive-viewer). Icon by Dima Hamayunau (https://dribbble.com/abybe).	Smartphone and tablet simulator on computer with several models to test mobile responsive websites.