Caffeine Half Life vs Aura

Caffeine Half Life helps you estimate how caffeine leaves your system over time — so you can make more informed choices about sleep and energy. Highlights - Personalized elimination curve using your profile (e.g. smoking, pregnancy, oral contraceptives) when you choose to provide them - Sleep-readiness estimates based on your bedtime and caffeine threshold — approximate only - Apple Health: optional read/write for dietary caffeine, plus HRV correlation on the chart so you can spot patterns (you control permissions) - Widgets and Apple Watch complications for quick glances — including a trend graph complication - Interactive chart — drag to inspect caffeine levels and HRV at any time of day How it works The app uses a simplified pharmacokinetic model (Bateman equation) to estimate caffeine absorption and elimination based on your personalized half-life. Factors like age, BMI, activity level, smoking, pregnancy, and oral contraceptives adjust the half-life up or down from the ~5-hour population average. Important: This app is for general wellness and educational purposes. It is not medical advice and not a medical device. All estimates are approximate — individual metabolism varies. Consult a healthcare professional for health decisions. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Sun protection is personal. Aura helps you plan sunscreen reapplication around the conditions you are actually in. It combines the current and forecast UV index with your self-reported skin type, SPF, and activity to create an easy-to-follow timer. PLAN AROUND LIVE UV Use your location to see current and upcoming UV conditions, or choose a UV value manually when you prefer not to share location. MAKE THE TIMER YOURS Choose your Fitzpatrick skin type, sunscreen SPF, and what you are doing outside. Swimming, exercise, water, and sweat can shorten the suggested interval. FOLLOW THE TIMER ANYWHERE Keep the countdown visible with a Live Activity on the Lock Screen and Dynamic Island. Optional local notifications can remind you when the timer ends. OPTIONAL TAN MODE Aura includes a sunset-capped session timer for people who choose Tan mode. UV tanning is not risk-free, and Aura never marks exposure as safe. BUILT FOR FOCUS Aura does not require an account. The calm, uncluttered interface keeps the forecast, remaining time, and next action easy to find. Aura provides estimates based on forecast data and the details you select. It does not measure UV exposure, guarantee protection, prevent sunburn, or provide medical advice. Always follow sunscreen directions and use shade, clothing, and other sun-protection measures.