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 / about 1 year ago
This chrome extension with all of the breakpoints set up https://chrome.google.com/webstore/detail/responsive-viewer/inmopeiepgfljkpkidclfgbgbmfcennb. Source: almost 2 years ago
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Responsive View - Test your responsive design across different devices
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Multi Screen Test - Test your site at different screen resolutions & devices.
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project
Responsinator - Designed to test responsive websites on different devices.