CLS Visualizer is a free Chrome plugin developed by MarketingTracer. This plugin aims to help web developers and designers in debugging and improving the Cumulative Layout Shift (CLS) of webpages. CLS is a user-centric metric that measures the visual stability of a webpage by quantifying how often users experience unexpected layout shifts.

With CLS Visualizer, web developers can easily identify and visualize the areas of a webpage where layout shifts occur. By highlighting and providing a visual representation of the CLS, this plugin allows developers to pinpoint and address the issues that may lead to a poor user experience.

Debugging CLS can be a challenging task, but CLS Visualizer simplifies the process by providing a visual approach to identify layout shifts. By using this plugin, developers can ensure that their webpages are visually stable and provide a delightful user experience.