Latest reviews, Germany App Store.
★★★★★Aug 15, 2026
Inaccurate AM SunWhen I am outside in August for 2 hours beginning at sunrise, this early-morning window produces little to no meaningful vitamin D in the US zone 8 (34°N).
Yet, this tracker has me at 2000 IU.
Vitamin D synthesis requires UVB (roughly 290–315 nm). These short wavelengths are strongly absorbed and scattered when the sun is low because the path through the atmosphere (and ozone) is much longer. Practical thresholds for useful vitamin D production are generally solar elevations above ~35–45° (when your shadow is shorter than your height is a common rough guide, corresponding to ~45°). Below that, UVB is minimal or effectively absent for cutaneous vitamin D production even under clear skies.
★★★★★Jul 14, 2026
Love it!Need Apple Watch version tho
★★★★★Jul 2, 2026
Total LifesaverAvoid overusing toxic sunscreen with this app. Works very consistently. Most valuable free app on my phone.
★★★★★Jun 24, 2026
BuggyConstantly pauses itself when it should be running in the background
★★★★★Jun 15, 2026
Very useful appIt is a very useful app that shows the uv index way more exactly than other apps - especially compared to the native weather app on iPhone. I would love an App for Apple Watch as well, because that would make tracking the uv exposure a lot more comfortable.
★★★★★Apr 15, 2026
REQUEST: Add field to dataWhen Sun Day entries get pulled into the Foodnoms app from Apple Health it uses the ‘Source: Sun Day’ field from the structured data as the title. I think if you added ‘Food Type: Sunlight’ or something like that it would improve how this displays in other apps.
