Caffeine Clock
How wired are you right now?
Log what you drank and when. We'll model caffeine's decay in your system using its actual half‑life, so you can see when you'll likely be clear enough to sleep.
How wired are you
0
mg active now
Clear
Today's peak
0 mg
≈ cups active
0
Half‑life
5.0 hr
Log a drink to see your bedtime forecast.
Caffeine curve
Active caffeine
Clear threshold
Now
Profile
Personalizes your forecast.
Most people feel minimal effects below this. Sensitivity varies a lot person to person.
Log a drink
Choose what you had, confirm when, then log it.
What did you have?
Today's drink history
Tap × to remove an entry.
Still climbing this late? A low‑caffeine tea keeps the ritual going without pushing your bedtime back.
Shop low‑caffeine tea →
Your caffeine clock
Or long‑press / right‑click the image to save it.