Know exactly how muchcaffeine is in your body right now.
Caffy tracks every coffee, tea and energy drink, then models your personal metabolism in real time — so you protect your sleep and feel in control.
Watch caffeine move through your body
Add a drink, drag your bedtime, and see how much caffeine is still in your system when your head hits the pillow.
Right now
111mg
Peak today
143mg
At bedtime
55mg
Elevated
Fair· Sleep score
Moderate caffeine at bedtime. You should be fine, but skip any more.
Add a drink
Your metabolism
A simplified model for demonstration. The Caffy app personalizes the curve to your age, body and sensitivity.
A model of how your body handles caffeine.
Real-time caffeine level
A personalized half-life model shows exactly how much caffeine is active in your bloodstream — not a generic countdown, but a curve tuned to your body.
A sleep score that warns you
Caffy knows your bedtime and tells you, before that last cup, whether it will cost you deep sleep tonight. Quiet nudges, not nagging.
Cut back without crashing
Guided caffeine detox programs step you down gradually, so you keep your energy and lose the dependence — at a pace your body can handle.
Weekly AI insights
Every week Caffy spots the patterns you can’t — your real triggers, your worst hours, the habits quietly shaping your sleep.
Widgets & Apple Health
Glance at your current level from the Home and Lock Screen, and sync seamlessly with Apple Health. Your data stays yours.
The math behind every number.
Caffy models caffeine with a pharmacokinetic half-life curve and a 45-minute absorption phase, adjusted for the factors that actually change how you metabolize it — age, sensitivity, pregnancy, smoking and more.
Models informed by FDA, EFSA, NIH and the Sleep Foundation.
Everything you might be wondering
Take control of your caffeine.
Better energy by day. Deeper sleep by night. It starts with knowing your number.