Caffeine Hourglass

Caffeine Hourglass Caffeine Hourglass is a lightweight, offline app designed to help you understand how caffeine may affect your alertness and sleep over time. Instead of guessing when caffeine “wears off,” the app provides a clear, time-based visualization of how caffeine gradually declines in the body after coffee, tea, or energy drinks. Whether you want to stay focused during the day or avoid caffeine lingering too late into the night, Caffeine Hourglass offers a simple reference to support better timing decisions. How it works Each caffeine intake is treated as an individual dose and estimated using a time-based decay model commonly described in scientific literature. When multiple drinks are consumed, their estimated effects are combined into a single curve, showing how caffeine may accumulate and fade throughout the day. You can optionally adjust parameters such as estimated half-life and bedtime to better reflect personal sensitivity and daily routines. Key features • Estimate remaining caffeine over time • Visual daily caffeine curve • Bedtime reference to see estimated caffeine at sleep time • Live Activity & Dynamic Island support for quick glances • Home & Lock Screen widgets • Fully offline — no accounts, no tracking, no data sharing Designed with care Caffeine Hourglass focuses on clarity, privacy, and simplicity. All data stays on your device. No sign-ups. No analytics. No ads. Important note Caffeine Hourglass provides estimates for informational purposes only. It is not a medical device and is not intended to diagnose, treat, or prevent any medical condition. Caffeine metabolism varies widely between individuals based on genetics, tolerance, lifestyle, and health factors. If you have health concerns related to caffeine or sleep, please consult a qualified healthcare professional. Privacy Your data never leaves your device.