ULookUp is a Chrome extension developed by km6276, available for free in the Browsers category under Add-ons & Tools. This tool allows users to look up the definition of any selected text on a webpage using Anthropic's Haiku model. By simply selecting a word or phrase, users can access quick explanations within the context of the current webpage, making it a convenient and efficient way to enhance understanding while browsing.

With ULookUp, users can easily access information without leaving the webpage, streamlining the search process and improving overall browsing experience. This extension provides a useful feature for those seeking quick definitions or explanations while reading online content.