UV Index App

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Don't get burned

UV Index App is here to shed light on sun exposure. Should you wear sunscreen today? How long should you stay outside? How does skin color affect safe sun exposure? What if it's cloudy? Find out here.

It's a matter of time

How long does it take to get a sunburn? How much exposure is necessary for adequate Vitamin D intake? What if I have lighter skin? What if I use sunscreen? We'll crunch those numbers for you based on the current weather and sun position.


calendar and graph

Forecast & History

Envision your sun protection plan with a 7-day forecast or relive the sunshine by checking out the 3-day history of UV Index data.

Customized for You

The sun affects us all differently. We help interpret the data to fit your specific needs:

skin colors

Skin Color

It is widely known that people with lighter skin tend to be more susceptible to sunburns while people with darker skin take longer to react to ultraviolet radiation. We break down exposure time estimates by each skin color on the Fitzpatrick Scale to estimate sunburn and Vitamin D times.

surface reflection

Surface Reflection

Whether you’re in the city or at the summit, the backyard or the beach, the surfaces around you can reflect up to 80% of UV radiation. Choose from different surfaces such as asphalt, sand, soil, snow and more.


Any Location

UV radiation varies based on numerous factors including latitude, time of year, altitude, ozone level and cloud cover. Using a set of globally available resources, we crunch the numbers for your location and time of day so you don’t have to.


Any Device

Uvindex.app is a device-agnostic platform and is designed to be accessible from desktop computers, tablets, and mobile devices. Oh, and it's also free to use.


The Meaning of UV Index

The UV Index (or ultraviolet index) was developed to help people protect themselves from ultraviolet radiation from the sun. While exposure to sunlight has health benefits in moderation, it poses serious health risks including sunburns, skin aging, cancer, immunosuppression, DNA damage and eye damage when excessive. The UV Index at any given time is presented as a number ranging from 0 to 14, representing values on a linear scale. A UV Index value of 0 means that there is no UV radiation, and a UV Index of 10 is intended to represent the UV radiation of a clear summer day at around noon.