UV Index, Vitamin D & Sunburn

4.0 is the biggest release since launch. UVSiesta now computes everything for you personally instead of picking a row out of a table. YOUR OWN NUMBERS A six-question Fitzpatrick quiz, plus your age, SPF habit and clothing, now drive every figure in the app: burn time, vitamin D minutes and your daily IU target. A REAL SUN WINDOW Instead of "sometime between 10 and 4", you get a narrow window built from today's hourly UV curve — and it stretches automatically when cloud cuts the UV. SUN LOGGING IS NOW FREE Log sun time in two taps, keep a streak, watch the daily ring fill. No timer and no subscription needed. History and the morning brief are free too. 14-DAY TAN PLAN (PREMIUM) Session lengths adapt to the tan you have actually built, and step back down if you stop. 7-DAY SUN PLANNER (PREMIUM) See which day this week is worth going outside for. The first two days are free. CLINICAL VITAMIN D (PREMIUM) Enter your 25(OH)D blood result for a personal target, a projection from the sun you log, and a re-test reminder. An estimate, not medical advice. ALSO IN THIS RELEASE • Real cloud attenuation from clear-sky data instead of a fixed multiplier • Widgets and the Apple Watch app show live progress • Fully translated into 48 languages • Faster, more reliable notifications