StopSun - UV Tracker

Do you know how much UV your skin receives today?
StopSun uses your Apple Watch and iPhone to automatically track and manage your UV exposure.
See at a glance how much UV you received during outdoor activities, how long your sunscreen lasts, and the current UV Index.
Key Features
1. Automatic UV Exposure Tracking (Apple Watch Integration)
Using the ambient light sensor on Apple Watch, StopSun automatically detects when you are exposed to sunlight outdoors.
Based on outdoor exposure data from the Health app, you can manage your UV exposure without manually logging it.
Supported Models
Apple Watch Series 6 or later / Apple Watch SE (2nd generation) or later / All Apple Watch Ultra models
2. Real-Time UV Index
Check the real-time UV Index based on your current location.
By combining exposure time with the UV Index, StopSun estimates the actual UV exposure your skin receives.
3. Sunscreen Timer & Live Activity
No more guessing when to reapply sunscreen.
With Live Activity, you can check your sunscreen duration in real time directly from the lock screen.
4. Personalized Alerts by Skin Type
Based on the Fitzpatrick skin type, StopSun calculates the maximum UV exposure your skin can safely tolerate in a day.
Receive smart alerts before your skin reaches a risk level.