Darkness is described as 'Provides beautiful dark themes for your favorite websites, significantly reducing the eye strain and fatigue caused by a bright screen' and is a dark mode enforcer in the web browsers category. There are more than 10 alternatives to Darkness for a variety of platforms, including Mac, Google Chrome, Mozilla Firefox, Windows and iPhone apps. The best Darkness alternative is Dark Reader, which is both free and Open Source. Other great apps like Darkness are Midnight Lizard, Noir, Dark Background and Light Text and Owl.