Hacktoberfest Detector is a free Chrome add-on developed by Ferned Networks. This add-on is categorized under Browsers and falls under the subcategory of Add-ons & Tools. Its primary function is to detect whether a GitHub repository has opted into the 2021 Hacktoberfest initiative, a collaboration between DigitalOcean and GitHub.

The Hacktoberfest Detector add-on provides a simple yet effective solution for users who want to quickly determine if a repository is participating in Hacktoberfest. Upon installation, the add-on displays an alert message whenever a repository is opted in to the Hacktoberfest initiative. It serves as a handy tool for developers and contributors who are looking to participate in the Hacktoberfest event.