Sunscreen Reminder App: An Alarm That Reapplies Itself Every 2 Hours

Dermatologists generally recommend reapplying sunscreen every 2 hours during sun exposure — sooner after swimming, sweating, or towel-drying. Most people know this and still don't do it, not because they don't care, but because a single alarm set for "2 hours from now" only covers one reapplication. A full day at the beach or on the water needs four or five, and resetting a one-time alarm by hand, repeatedly, while wet and sunburnt-adjacent, is exactly the kind of small friction that makes people skip it.

Why one alarm isn't enough for a full day outdoors

A typical day outdoors — 10 a.m. to 6 p.m. — needs sunscreen reapplied around four times at a strict 2-hour spacing. Setting four separate one-time alarms means remembering to do that math before you even leave the house, and resetting each one as it fires means finding your phone, unlocking it, and manually queuing the next reminder while you'd rather be doing anything else.

Where a 2-hour reapplication reminder helps most

Setting a 2-hour sunscreen reminder

Because the alarm resets from dismissal rather than from a fixed clock time, an early reapplication after a swim doesn't throw off the rest of the day — the next reminder simply moves with it.

A reminder that survives an actual beach day

The practical test for any reapplication reminder is whether it still works with wet hands, sand, and a phone you're trying not to check every ten minutes. A loud, full-screen alarm — rather than a notification banner easily missed in bright sunlight — is what actually gets noticed outdoors. Once it fires, dismissing it takes one tap, and the day's schedule keeps running without any further setup.

Frequently asked questions