I Feel You – Cancer Edition is a web based application designed to help individuals undergoing cancer treatment log and track their symptoms. The primary function of the tool is to allow users to record symptoms they notice during their treatment and then see whether other people on the same medications have reported similar symptoms. It aggregates this information both from other users of the app and from reports submitted to the FDA. The application is free to use, anonymous, and operates entirely within a web browser, requiring no installation or account creation. The main capabilities of the tool include symptom logging, anonymous comparison with other patients, and access to aggregated data on symptom frequency for specific cancer treatments. The application does not collect personally identifiable information, and all data is handled without requiring user registration. A technical requirement is that the user’s browser must have JavaScript enabled for the app to function. The tool is hosted at the URL cancer.ifeelyou.app, and further information about the project is available at noted.care. In a typical workflow, a user navigates to the website, selects their cancer treatment regimen from a list of medications, and then logs any symptoms they are experiencing. Once logged, the app displays how many other users on the same treatment have reported that symptom, along with a comparison to FDA adverse event data. This process allows individuals to see if their experiences are common among others receiving the same therapy. The tool is intended to support awareness and communication, not to replace professional medical guidance. The application explicitly states that it does not provide medical advice. Users are advised that if a symptom feels severe or like a medical emergency, they should call 911 or their local emergency number immediately, or contact their care team. The service is designed as a supplemental resource for information gathering rather than a diagnostic or treatment tool.