UV-Sensitive Smart Cap is a wearable sun-safety device that measures real-time UV radiation and turns it into simple, actionable alerts. An ESP32 and UV sensor mounted on the cap continuously calculates UV Index and cumulative daily dose, then sends readings via Bluetooth to a phone app dashboard. The app shows current exposure, peak UV, and time-to-reapply-sunscreen notifications, while the cap can also trigger LED/vibration warnings for hands-free use. Ideal for athletes, commuters, and kids, it builds better sun habits outside.