Based on our record, Responsive Viewer seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Bonus! Useful Chrome extension for Responsiveness Testing. - Source: dev.to / 11 months ago
This chrome extension with all of the breakpoints set up https://chrome.google.com/webstore/detail/responsive-viewer/inmopeiepgfljkpkidclfgbgbmfcennb. Source: over 1 year ago
Polypane - The browser for ambitious web developers that want to 5× their quality and efficiency.
Responsinator - Designed to test responsive websites on different devices.
CSS Scan - Instantly check or copy computed CSS from any element for only ~95$
Responsive Website Test - Test any website on desktop, mobile, and tablet
Wireframe for Figma - Lightning fast wireframing on figma (500+ elements)
Multi Screen Test - Test your site at different screen resolutions & devices.