The AI Coach answers using your own logs (meals, workouts, weight) and can log food, workouts, water, sleep and weight for you when you ask. On the free plan it helps with using the app and gives you 3 coach replies a month; the full coach, up to 100 messages a day, comes with the optional Plus subscription. It's an AI, not a human coach, dietitian or doctor: it can suggest meal ideas that fit your targets, but it doesn't give medical advice.