Sun Risk



Sun Risk


Why UV




Use Sun Protection





Skin aging

Skin cancer


"...a smart watchOS app that uses some of the platform's best features to bring UV forecasts to the wrist."


Sun Risk shows the risk of skin damage from the sun.
Here's why:

"Melanoma, the most serious form of skin cancer, is now one of the most common cancers among adolescents and young adults ages

- United States Environmental Protection Agency

The real effects of
UV radiation exposure:

Every day, we are exposed to ultraviolet radiation (UV) that is aging and killing us. Unprotected exposure to UV from the sun in our daily lives is the primary cause of both skin aging and skin cancer.

One American dies from skin cancer every hour.

More than 90% of all skin cancers are caused by sun exposure.

Up to 90% of skin aging is actually caused by sun exposure.

The UV Index.

Thankfully, scientists have created the UV index. Using a simple number scale of 1 to 11+, the UV index shows the risk of skin damage from the sun at a given time and place. Sun Risk uses the UV index to estimate the risk of sunburn.

Here’s how Sun Risk shows you the risk of skin damage:

Simple descriptions

Sun Risk uses straightforward descriptions, so you don't have to guess if you need sun protection.

Down to the hour

Sun Risk shows the risk of skin damage down to the hour for a single day, so you can plan a sun-safe day.

Multiple locations

In the main app, see the risk of skin damage in up to 4 other U.S. cities of your choice.

Widget and watch app included

See the risk of skin damage right on your phone's lock screen or Apple Watch face.

Sun Risk shows you the risk. It's on you to protect yourself.

Sunscreen - rub it on

Sunscreen provides temporary protection from harmful UV rays. However, sunscreen must be reapplied every two hours, or whenever sweat or water wash the sunscreen off.

Sunglasses - your eyes can burn too

Your eyes can be damaged and burned from UV rays just like your skin. Sunglasses that block 100% UVA + UVB are essential to protect your eyes from sun exposure.

Umbrellas - not just for rain

A black handheld umbrella can block over 90% of UV rays. This makes a dark-colored handheld umbrella a convenient means of personal sun protection.

Clothing - cover exposed skin

Clothing that covers your skin helps to reduce the amount of UV that reaches your skin. Long pants, long sleeve tops, and hats are all great for cutting down on UV exposure.

I'm Evan, the founder of Interface Labs, the company which designs and builds Sun Risk.

If you have any questions, trouble with the app, or just want to chat, I'd love to hear from you!