A personal tool that shows the current UV index for your location and estimates how long until unprotected skin would sunburn — and when you can top up vitamin D.

Data. UV comes from CAMS / Copernicus (the EU's atmosphere-monitoring service) via Open-Meteo, on an hourly grid, interpolated to the current minute. Weather and sun times come from Open-Meteo. When you use your location, the name of your area is looked up via Photon, an open European geocoder built on OpenStreetMap.

Estimates. Sunburn and vitamin-D times are modelled from the UV level, your chosen skin type and surroundings, and deliberately lean cautious. They're estimates, not measurements or medical advice.

Privacy. Your location is never stored, and it's rounded to about a kilometre (two decimal places) in your browser before it's sent — so the forecast service (Open-Meteo) and the area-name lookup (Photon) only ever receive a coarse position, never your exact coordinates. No accounts, no cookies, no tracking, no ads. See the full privacy page for what every tool sends and where.