Web-based platforms may transform training and assessment for surgeons’ nontechnical skills. Based in the behavioral sciences, nontechnical skills include the cognitive skills (eg, situation awareness, decision-making) and social skills (eg, communication and teamwork, leadership) that are essential for providing safe and effective care in the operating room (OR). Several frameworks have been developed to describe these skills for different OR personnel, including Nontechnical Skills for Surgeons (NOTSS) and NOTECHS (also known as Oxford Non-Technical Skills) for entire OR teams.1 To date, trainings and assessments for nontechnical skills have typically been conducted in person. To widen access, we created an online simulation platform for training and assessing surgeons’ nontechnical skills at scale: eNOTSS (http://enotss.herokuapp.com/).