Sunpop: UV Index & Burn Timer
SPF, sunburn alert & vitamin D
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Summer is peak burn season. Sunpop tells you exactly how many minutes you can stay out today — for your skin type and your SPF. No account, everything on device.
"UV 7" tells you nothing. Sunpop turns it into a number you can act on: how many minutes you can stay in the sun today before your skin starts to burn.
The estimate is calculated for you — your Fitzpatrick skin type, your sunscreen SPF, and the live UV index at your exact location — not for an average person on an average day.
HOW LONG UNTIL YOU BURN
See your personal burn time on the home screen, updated as the UV changes through the day. Add your SPF and watch the window extend. The model uses a cumulative dose curve rather than a flat countdown, so the number stays honest as the sun climbs and drops.
SUN SESSION TIMER
Tap Start Sun Session before you head out. A Live Activity on your Lock Screen and Dynamic Island counts down your remaining safe time, so you never have to unlock your phone at the beach. Reapply reminders arrive every two hours. Tap Stop and it all ends immediately.
VITAMIN D, TRACKED
Sun is not only a risk. Sunpop estimates the vitamin D from each session, based on UV intensity, skin type and exposed skin area, and tracks it against your daily goal — so you can find the balance instead of avoiding the sun entirely.
HOURLY UV FORECAST
Plan the run, the ride or the beach around the UV curve. See when today's peak hits, and when there is a safe window for a short break.
LOCK SCREEN AND HOME SCREEN WIDGETS
Current UV and your remaining burn time, visible without opening the app.
NOTIFICATIONS THAT ARE ACTUALLY USEFUL
- Morning Brief at 8:00 with the day's UV outlook
- High UV alert when levels turn dangerous
- Burn warning before you reach your limit
- Reapply reminder during an active session
- Sun Window nudge when UV is pleasant for a short break
Every one of them can be turned off individually.
YOUR HISTORY
Every session is saved: time in the sun, vitamin D earned, burns avoided.
BUILT ON PUBLISHED SCIENCE
Most sun apps show a coloured scale and tell you to wear sunscreen. Sunpop's numbers come from the Fitzpatrick skin type scale, WHO UV Index guidance and published erythema research, with the SPF model following the standard ISO 24444 methodology. Every constant in the app is documented and sourced.
PRIVATE BY DESIGN
No account. No sign-up. No backend. No tracking, no ads, no analytics profile. Your skin type and your session history never leave your iPhone. Weather data comes from Apple WeatherKit.
Sunpop provides educational estimates to help you avoid sunburn. It is not medical advice and cannot predict how your skin will react. If you have a skin condition, take photosensitising medication or have a history of skin cancer, follow your doctor's guidance.
Requires iOS 17 or later. Location access is used only to fetch UV data for where you are.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Przemyslaw Bocer, 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 Linked to You
The following data may be collected but it is not linked to your identity:
- Location
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Przemyslaw Bocer
- Size
- 7.5 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Location
- This app may use your location even when it isn’t open, which can decrease device battery life.
- Languages
- English
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- Copyright
- © 2026 Przemysław Bocer