Brave vs Polypane

Brave is a privacy-focused web browser built on Chromium that blocks ads and trackers by default. It features a built-in ad blocker, optional privacy-preserving ads via BAT tokens, and a built-in Tor browsing mode.

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.