Who Built It is a Chrome extension developed by nattheriddle1 that helps users identify which website builder was used to build a site. With this extension, users can easily find out if a site was built using WordPress, Wix, Weebly, Webflow, Unbounce, Swipe Pages, Squarespace, Shopify, Readymag, Leadpages, Kajabi, HubSpot, Gatsby, Docusaurus, ConvertKit, or ClickFunnels.

The extension works by analyzing the source code of the website and looking for telltale signs of specific website builders. It provides users with an automatic and convenient way to determine the platform behind a site without any manual investigation.

Whether you are a web developer, designer, or simply curious about the technology behind a website, Who Built It is a useful tool that provides valuable insights into the website building process. With its support for a wide range of popular website builders, it helps users gain a better understanding of the tools and technologies used in website development.