StopSun - UV Tracker
UV Tracker & Sunscreen Timer
Free · Designed for iPhone. Not verified for macOS.
Today’s smart UV guide for your skin.
Track UV exposure with Apple Watch and protect your skin.
StopSun monitors how much UV your skin receives today in real time.
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.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
* Version 1.0.1 Update
The app can now be used without an Apple Watch.
The developer, Taein Kim, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Taein Kim
- Size
- 24.9 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 18.5 or later.
- iPhone
Requires iOS 18.5 or later. - Mac
Requires macOS 15.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.5 or later. - Apple Watch
Requires watchOS 11.5 or later.
- iPhone
- Location
- This app may use your location even when it is not open, which can decrease device battery life.
- Languages
- English and Korean
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment Information
Contains
Health or Wellness Topics
- Copyright
- © 2026 Xcode-blue