UV Index + SPF & Sun Widget

Instant UV index check before you step outside. Free UV widget, UVI forecast, and SPF & PPD sunscreen calculators — built for sun safety, skincare, and anti-aging awareness.
UV Index + SPF & Sun Widget calculates a theoretical UV index (UVI) for your exact location and time, estimates UV on skin-facing angles like the face, neck, shoulders, and arms, and helps you plan sunscreen use with built-in SPF and PPD (UVA protection) calculators. All core features are free — no subscription, no paywall.
Beyond sunburn and skin cancer, ultraviolet exposure and other actinic damage (UVA, UVB, visible light, and infrared) account for roughly 80% of visible skin aging and photoaging. Most people underestimate their daily UV exposure — because the UV index apps and weather services they rely on have two problems this app was built to solve.
PROBLEM 1 — DELAYED UV DATA
Most UV index apps pull measured ultraviolet readings from weather sources like NOAA. Those readings are typically delayed by an hour or more, so the UV index you see may already be stale.
This app calculates a theoretical UV index from your coordinates, time of day, and atmospheric path. The UVI updates instantly with the sun — no waiting for the next weather refresh.
PROBLEM 2 — HORIZONTAL-ONLY UV READINGS
Standard UV index readings measure a flat horizontal surface. That's not how your skin faces the sun.
Your face, neck, shoulders, and arms tilt toward the sun at angles that can receive significantly more UV than a horizontal reading suggests. This app applies a tilt correction to estimate UV on skin-facing angles, giving you a more cautious UV index to act on.
The UVI calculation assumes clear sky by default to produce the highest theoretical UV for that moment. Optional cloud-condition toggles let you adjust for overcast weather and realistic daily sun protection planning.
KEY FEATURES
- Theoretical UV index / UVI calculator with surface-angle tilt correction
- Free home screen UV widget with cached GPS
- Hourly, daily, and monthly UV index forecasts
- SPF sunscreen calculator
- PPD (UVA protection) calculator
- Cloud-condition toggles
- Full offline support with cached UV data
- All core features free — no subscription
WHY PEOPLE USE IT
- Instant UV index estimates for any location — no waiting for delayed UV readings
- See UV on tilted skin-facing surfaces like the face, neck, shoulders, and arms
- Stay aware of UV-driven skin aging, photoaging, and actinic damage
- Quick UVI check from the home screen widget — no app open required
- Plan sunscreen use with the SPF and PPD calculators (sun protection is recommended at UVI 3 or higher)
- Adjust UV estimates for cloud conditions and overcast weather
- Works offline with cached UV data when your connection is limited
PERFECT FOR
- Daily UV index checks and sunburn prevention
- Skincare, anti-aging, and photoaging awareness on the face, neck, and arms
- Sunscreen and SPF planning when UV is 3 or higher
- Sun safety on outdoor walks, hiking, running, cycling, beach days, sports, and travel
- Commuting, dog walking, and gardening
- Comparing current UV with daily and monthly UV forecasts
- Deciding when to apply and reapply sunscreen
WHAT MAKES IT DIFFERENT
Other UV index apps show delayed horizontal-surface readings. This app gives you an instant theoretical UV estimate corrected for the angle your skin actually faces the sun.
No sensor delay. No horizontal-only limitation. A cautious UV estimate you can act on.
IMPORTANT NOTE
The UV index, SPF, and PPD values in this app are educational estimates for personal planning and awareness. They are not a substitute for measured UV data, sunscreen product labels, professional sunscreen testing, medical advice, or regulatory compliance. Always follow your sunscreen product label and consult a dermatologist for skin health and skin cancer concerns.