On Which? is a free Chrome extension designed to identify the underlying technologies of any website visited. With a single click, users can access detailed information about various technologies such as content management systems, frameworks, analytics, and ecommerce solutions. This tool is ideal for web developers, marketers, and anyone interested in understanding how websites are built. It supports over 7,900 web technologies across more than 30 categories, providing a comprehensive overview of the tools used by different sites.

The extension offers a user-friendly interface that displays the technology profile in an organized manner. Users can view their analysis history for the past seven days and export this data as a CSV file with a free account. On Which? ensures user privacy by performing technology detection locally, without tracking browsing behavior or collecting personal data. This makes it a reliable choice for professionals and curious individuals alike.