RealEye is an online research platform that uses webcam eye-tracking to analyze user attention and emotions. It leverages a deep neural network (AI) running entirely in the browser to predict gaze points with up to 60 Hz frequency and approximately 110-pixel accuracy. The platform supports various stimuli, including images, videos, live websites, and interactive mockups. Data is collected via webcam, mouse, and keystroke tracking, with follow-up surveys. Privacy is maintained by processing all video locally and storing only text-based gaze coordinates. RealEye offers a study dashboard, data export, and API integration. It features a built-in panelist network for recruitment. The tool is GDPR compliant and trusted by freelancers, companies, students, and universities. Educational discounts are available.