Sun Day
Your UV coach - know exactly when to soak it up or hide
1 follower
Your UV coach - know exactly when to soak it up or hide
1 follower
Sun Day turns your phone into a personal sun coach. Get real-time UV for your exact spot, track your vitamin D minute by minute, and get a gentle nudge the moment your skin needs a break. 100% free, no ads, no tracking. iOS & Android.
Hey Product Hunt 👋
I'm Antoine, and Sun Day is the app I wish I'd had the summer my girlfriend came back from a "quick 20 minutes at the park" with shoulders the color of a stop sign.
The problem. Weather apps show a UV number next to the temperature, and that's it. No context, no alert, no idea if that "6" means grab a hat or go make vitamin D. Meanwhile ~1 adult in 2 in Northern Europe is vitamin D deficient, and skin cancer rates keep climbing. The data exists, it's just buried.
What Sun Day does.
☀️ Real-time UV for your exact GPS location (powered by Open-Meteo)
🧬 Personalized vitamin D synthesis, adjusts to your skin type, clothing and age
🔔 Smart alerts: "you hit your daily dose, time to cover up", never spam
🌙 Moon phase, sunrise/sunset, hourly forecast as bonus
🔒 Fully on-device. No ads. No tracking. No account.
Why free and ad-free. Sun Day is built by DIH LABS, a French non-profit. We don't need to monetize your attention, dues and our other apps fund the work.
I'd love to hear: what's the one thing a weather app has never told you about the sun that you wish it would? Any feedback on the vitamin D model especially welcome, it's the part I'm most obsessed with getting right.
Thanks for checking it out 🌞