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TANNED needs JavaScript to work out where the sun is.
The sun where you are: the UV through the day, when to go out, when to reapply, and who is running something outside nearby.
Nothing about you leaves this phone. TANNED's server is only ever asked about a 3-digit ZIP area.
All of it on this device, none of it on a server.
Only the 3-digit ZIP area, to ask TANNED's server for the EPA's UV forecast and for sessions near it. No name, no account, no location, no tracking.
UV forecasts from the US EPA in the US; everywhere else, the app's own clear-sky estimate. Towns from GeoNames (CC BY 4.0) and US ZIP areas from the US Census Bureau. The sun's position from a standard solar algorithm; UV bands from the WHO's Global Solar UV Index.
Sun care is practice, not a promise. TANNED is not medical advice: ask a dermatologist about your skin.
Photographs: open-licence placeholders from Wikimedia Commons until TANNED's own shoot. Credits are in the Magazine.
On an iPhone, add TANNED to your home screen from the Share menu.
Privacy: what the app keeps and sends
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Sun Stories · the first roster