UV Index – Sundoze
Burn time & vitamin D, daily
About
This app provides personalized sun exposure guidance based on your skin type, location, and altitude. It offers modes for maximizing vitamin D or minimizing sun damage, with features for travel and winter conditions.
What's New in UV Index
1.2
June 13, 2026
Supplement logging is now free. New: weekly summary in Insights, free UV widget. Pro now includes your unlimited history and all widgets.
Subscriptions & In-App Purchases
Sundoze Pro Yearly
Unlock all modes, Travel cities, and Winter Mode.
Developer apps
FAQ
What is Sundoze's primary function?
Sundoze provides personalized sun exposure guidance tailored to your skin type, location, and altitude. It helps you determine the right amount of sun for vitamin D, safe tanning, or avoiding sunburn.
Does Sundoze have ads?
No, Sundoze is ad-free and does not track your data, focusing solely on providing accurate sun exposure calculations.
What are the different modes in Sundoze?
Sundoze offers 'MORE SUN' for vitamin D or tanning, and 'LESS SUN' to track burn time and remind you to reapply SPF. It also includes 'TRAVEL MODE' and 'WINTER MODE'.
How does Sundoze account for altitude?
Sundoze calculates how UV intensity increases with elevation, offering more accurate readings for mountainous regions by correcting for altitude.
What is the 'Winter Mode' in Sundoze?
In winter, when UV levels are low for vitamin D production, Sundoze switches to a supplement-tracking mode to help you maintain consistent vitamin D intake.
What is the pricing for Sundoze Pro?
Sundoze Pro is available with a yearly subscription for $12.99, which includes a 7-day free trial. This unlocks unlimited travel cities, full winter mode tracking, and a 7-day UV index forecast.
What skin types does Sundoze support?
Sundoze uses the Fitzpatrick I–VI skin-type system for its burn-time calculations, calibrating advice against dermatological research for personalized results.
What devices is Sundoze available on?
Sundoze is supported on Apple Watch and iPhone, allowing you to check UV index and sun exposure information conveniently on your preferred devices.
