Tennis AI analyzes tennis technique using AI and computer vision across 107 biomechanical data points. Starting June 2026, every tennis coach in the world gets a free Pro subscription. Invite 3 students = 2 months free. 5 students = 6 months free. 10 students = 1 full year free. Everything in the app is piloted by Coach Axel, your AI co-coach available 24/7. No credit card. No waitlist. Available worldwide.