The smart, simple way to get enough sun without burning.

HELLO SUN

Real-time vitamin D estimates and sun + supplement tracking, with conservative burn-risk guidance—personalized to your skin type and location. No ads. No data selling.

Suggestions

Have an idea for Hello Sun? Tell us what would make it better for you.

Safety-first sunshine, built on trust.

Real-time vitamin D estimates with adaptive safe limits and burn-risk guidance—personalized to your skin and location. Stored locally, ad-free, and designed for real life.