Arc vs Polypane

Arc is a Chromium-based web browser developed by The Browser Company that reimagines the browser interface with features like Spaces for organizing tabs, a sidebar-first design, and built-in tools for capturing and annotating web content.

Polypane is Browser built for web developers, showing multiple viewports simultaneously with built-in accessibility and layout debugging tools.. It is available under a paid model. This tool falls under the browsers category.