Black and White is a free Chrome extension developed by Jannes Meyer. As the name suggests, this extension turns web pages into a black and white format. When activated, it disables borders, outlines, background colors, text colors, box shadows, and text shadows, leaving only the essential elements visible.

Using Black and White can be a useful tool for web designers and developers. By stripping away the visual distractions, it allows for a clearer evaluation of the information hierarchy and typographic structure of a web page. This simplified view helps to ensure that the design adheres to a coherent visual grid.

Overall, Black and White is a straightforward and effective Chrome extension for those seeking a simplified browsing experience. It provides a unique perspective on web design and can be a valuable tool for designers and developers alike.

Note: Black and White's source code is available on GitHub under the GPLv3 license.