Sunscreen Timer: SPF Reminder

Sunscreen wears off faster in open sun than on a grey afternoon, and faster outside than inside. "Every two hours" doesn't know which day you're having. Sunscreen Timer does. Tap the sun when you apply; the countdown follows the UV you're actually getting, clouds and all, and lets you know when it's time to reapply. HOW IT WORKS Tap the sun, or tell Siri, each time you put sunscreen on. A tap needs a second tap to confirm, so an accidental touch on your wrist can't reset the timer you're relying on. Then wait — most days it asks once, or twice. A BUDGET, NOT A CLOCK The timer combines the UV forecast and cloud cover from Apple Weather, the sun's angle where you are, and the minutes your watch records in daylight to track how much of your sunscreen's protection you've used up, instead of counting down a fixed two hours. The forecast is fetched once a day; out of signal, the app estimates…