Caffeine Half Life vs PepLedger

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/

The fastest way to track your peptide protocol — without a spreadsheet. PepLedger logs every dose in one tap, rotates injection sites for you, plans your ramps and tapers, tracks your inventory, and exports a clean PDF when it's time to talk to your provider. Built for people running real protocols: GLP-1 weight loss, recovery, training support, hormone optimization, and longevity stacks. WHAT YOU CAN DO • One-tap dose logging, automatically tracking your inventory and logging your plans • Smart injection-site rotation with configurable rest periods • Protocol planner — daily, weekly, every X days, with ramp, hold, taper, and rest phases • Provider PDF export (30 / 90 / 180-day) for clinician hand-off • Adherence grid, serum-level estimates, body composition and spend insights • Inventory tracking — including low-stock alerts • Apple Health read-only sync (weight, body fat, waist) • Face ID lock, on-device storage, optional iCloud backup PRIVACY-FIRST Your data stays on your device by default. iCloud backup is optional, encrypted, and entirely yours. No account required, no selling data, ever. PepLedger is a personal self-tracking tool. It is not a medical device, does not provide medical advice, and is not a substitute for your clinician. If you have any feedback, questions, or feature ideas, feel free to email us at support@pepledger.app. Terms: https://pepledger.app/terms/ Privacy: https://pepledger.app/privacy/