Free · Works in your browser · Spain & beyond
Is it sunny there right now?
Sunm tracks your sun exposure in real time — vitamin D, burn risk, building-level accuracy.
Works in your browser · installs as an app
Intelligence in motion
Real-time UV tracking that moves with you
Most apps assume you're standing still. Sunm's Sun Compute Engine follows your pace. As you move from sun-drenched avenues to shaded side streets, your UV intake and vitamin D progress update in real time.
- Building-level accuracy: Every shadow on your path, factored in.
- Personalised to your skin: Burn risk calculated against your Fitzpatrick type — not a city average.
- Live safety alerts: Notified when your cumulative UV dose approaches your skin’s limit.
The Sun Compass
Real-time solar tracking in one glance
The Sun Compass shows you exactly where the sun is right now — its bearing, elevation, and time until sunset. As you move or time passes, the compass moves with it. Tap it to see temperature, wind, and sky conditions for your location.
The Sun Compute Engine
Sun and shade, calculated to the building you're next to
Most UV apps give you a single number for your whole city. Sunm's Sun Compute Engine maps actual building geometry against the sun's position — to tell you whether you're in direct sun or shade right where you're sitting. Not the plaza 400 metres away. Not an average. Here.
That precision matters whether you're chasing vitamin D or protecting yourself. Sunm is the only app that knows the difference between sitting on the sunny side of the terrace and the shaded side — and adjusts your numbers accordingly.
Everything Sunm does
Track any moment outside
At a terrace, in a park, walking to the market. Start a session wherever you are — Sunm handles the rest.
Your burn risk, not a city average
Personalisation based on your Fitzpatrick skin type (your melanin level) means your safe window is calculated for you — not for an imaginary average person in your postcode.
A vitamin D total that actually grows
Your dashboard accumulates real session data — not estimates from a generic model. See your week, your streak, your daily target hit or missed.
Discover where the sun lands near you
The map shows sun and shade across nearby venues in real time — so you can choose where to sit, where to walk, and where to avoid.
Coming soon: upload a route, see the shade
SoonPlanning a hike or a run? Soon you'll be able to drop in a GPX file and see exactly where the shadows fall before you leave.
Currently live in
More cities coming. Request yours →
How it works
See nearby places
Cafés and terraces colour-coded by sun or shade right now.
Start a sun session
Tap anywhere to begin tracking. The Sun Compute Engine measures your vitamin D and burn risk in real time.
Know what you earned
See your session summary — vitamin D, time in sun, burn risk — the moment you finish.
Built for both sides of the sun
Make every minute outside count
Track your vitamin D, find the sunniest spots, and know exactly when you’ve hit your daily goal.
Own your shade time
Real-time burn risk alerts, shade maps, and UV dose tracking — so you stay safe without guessing.
Tracks you wherever you go
Walking, running, cycling. The Sun Compute Engine follows your route — so your vitamin D total and burn risk are accurate whether you stayed still or covered 10 kilometres.
Add to your home screen in seconds
No app store. Open sunm.app in Safari or Chrome, tap Share, and add it like any app.