The 2021 United Airlines NYC Half App is a free lifestyle application designed for iPhone users, aiming to enhance the experience of participants and spectators during the race. Key features include real-time runner tracking, allowing users to follow their favorite runners on a map, and live feeds that provide updates from the race course. The app also offers detailed profiles for each runner, including professional athlete biographies, enriching the overall context for spectators.

In addition to tracking capabilities, the app serves as an essential resource for race-day information. Users can access vital details to prepare for the event, ensuring they stay informed about the schedule and logistics. This comprehensive tool not only fosters a supportive atmosphere for runners but also enhances engagement for family and friends cheering on their loved ones.