HackOne is a free Chrome add-on developed by Bilawal Hameed that allows users to securely manage their hacker profiles. With HackOne, users can save their hackathon details, such as shirt size, food preferences, and past projects, directly on their computer. The information is stored locally and can be accessed instantly whenever needed.

One of the key features of HackOne is the ability to securely share this information with verified third-party hackathons and events. Users can simply click a button on their toolbar to share their details with trusted organizers, allowing for a tailored and personalized experience at these events.

It's important to note that nothing is stored externally, and the verification process is handled by an external server in a sandboxed environment. This means that the server cannot access the user's data, ensuring maximum security and privacy. Only the user and the sites they explicitly authorize can access the data.

HackOne provides a convenient and secure solution for hackers to manage their profiles and streamline their participation in hackathons and events. With its user-friendly interface and robust security measures, it is a valuable tool for any hacker using Chrome.