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
Carrd - Simple, responsive one-page site creator.
Responsinator - Designed to test responsive websites on different devices.
Webflow CMS - Build professional dynamic websites without any code
Responsive Website Test - Test any website on desktop, mobile, and tablet
Grid Layout Builder by Webflow - A completely visual way to build CSS grid–powered layouts.
Multi Screen Test - Test your site at different screen resolutions & devices.