Caffeine curve
last 12 h → next 18 hYour drinks
Damage report
Today's receipt
Účtenka is Czech for receipt. Every drink today, itemised: screenshot-worthy proof of your life choices.
More numbers
Inside you right now
live, updates every few secondsMolecule mood: sleepy
⚡ Reflex lab
no results yetDoes caffeine make you faster? Test yourself at different caffeine levels and watch the pattern appear.
⏰ Bedtime planner
OK to sleep = under 50 mg in you☕ Caffeine converter
🔁 Your habit
Did you know?
How the math works
A drink takes about 45 minutes to absorb. While it absorbs it already counts as in your body (the faded part of the ring). Then half of it leaves you every ~5 hours, faster if you smoke, slower with birth control or pregnancy. Blood level = absorbed caffeine ÷ ~0.6 L of body water per kg. The 400 mg daily limit is the EFSA / FDA guideline for healthy adults (200 mg when pregnant). Monster, Monster Zero and Red Bull have 32 mg per 100 ml, Madmonq 155 mg per tablet. Coffee uses typical café servings: one espresso shot ≈ 63 mg, a cup of filter coffee ≈ 95 mg, but real coffee varies a lot with the bean, roast and barista. An estimate for fun and awareness, not medical advice.
Trophy room
0 / 22 unlocked · tap a locked one for a riddleAbout you
used for the blood-level mathHalf of the caffeine leaves your body every hours.
Prices
for the damage report☕ Coffee prices (café)
Sound & extras
Sync
Use your drinks, trophies and settings on all your devices. No account needed: you get a secret code, and every device with that code stays in sync.
Your sync code. Enter it on your other devices, and keep it secret: anyone with it can see and change your data.