Everyone clears caffeine at a different speed — it's why the same cup keeps one person up until 2am and barely touches someone else. Answer 3 quick questions, then try it live on your own timeline.
Just a quick read from 3 questions — not a lab test. Caffeinly's app models your real half-life from your actual habits. General wellness information, not medical advice.
Add the drinks you'd actually have today — your curve, sleep-safe cutoff, and crash/jitter risk update live, using the same math as the app.
Shaded zone = your expected afternoon dip — it scales with how high your caffeine peaks today, so it grows or shrinks as you add and remove drinks.