Measured · mindful · safe

The light your body was built for.

SunMaxx turns sunshine into a number you can trust. Track the vitamin D you make, know your burn limit before you reach it, and find the safest windows to step outside.

Start your first soak Free · iPhone & Apple Watch
0
IU today
Your daily dial
Every ray, counted toward your goal.
2.840
IU today
Goal 5.000 · 57%
2.840
Today
UV 3
Now
42m
Burn
Gentle on your eyes
Catch the soft light, skip the glare.

SunMaxx finds the golden windows, when the sun is low and UV stays under 2, and guides a calm, timed gaze that never asks you to strain.

◷ Suggested gaze · up to 60s at a time
∞
Burn-time at UV low
Step out worry-free when the sun is soft. We watch the clock so you don't have to.
Before you soak
Know your sweet spot, and your limit.
Type III · Light olive · Tans gradually
Face & Hands
~400 IU
Tee & Shorts
~1.250 IU
Shirtless
~2.150 IU
Swimwear
~3.150 IU
Fully bare
~3.950 IU
½ MED · Sweet spot
3.150 IU
1 MED · Burn dose
7.750 IU
Your Spots
4 favorites · 0 sessions
San Francisco
☀Sun spot ☀Sun spot ☀Sun spot
▮▮ Map

Step outside. Soak smarter.

The oldest source of light there is. Measured, mindful, and safe.

Download on theApp Store