MoonCaff: Caffeine Tracker

Wondering how much of this afternoon's coffee will still be around at bedtime? MoonCaff gives you a quick estimate from the drinks you log.

HOW IT WORKS
Every drink you enter is treated as taken in at the time you pick and halved every 5 hours. MoonCaff adds up what remains of each one and shows you the result now, at your bedtime and along a curve in between. The Guide tab walks through an example: 100 mg becomes 50 mg after 5 hours and 25 mg after 10.

THE NOW SCREEN
• Estimated caffeine in you right now
• Today's total next to a 400 mg bar – a general adult reference figure, not a personal limit
• The time the estimate falls under 25 mg, with the date when that is tomorrow
• Your bedtime, adjustable in 15-minute steps, with the estimate at that time without and with the drink you are about to log

LOGGING
Pick espresso, coffee, cold brew, black tea, green tea, cola, an energy drink or dark chocolate, or enter any amount from 1 to 1000 mg. Say whether you had it now or 30 minutes, 1 hour or 2 hours ago. A 6-second Undo catches mistakes.

HISTORY
Days are grouped with their totals, the last 7 days are shown as bars against the 400 mg line, and any entry can be deleted after you confirm.

WHERE IT HELPS
• Comparing the bedtime estimate with and without one more coffee
• Seeing how a late-afternoon energy drink carries into the evening
• Keeping a simple day-by-day record of what you drank

PLEASE NOTE
MoonCaff does not measure anything. Numbers come only from what you enter and from a fixed 5-hour half-life, while real half-life differs between people. It is not medical advice – for health questions about caffeine, ask a qualified professional.

This app is not a medical device and does not diagnose, treat, cure or prevent any medical condition. Consult a healthcare professional for medical advice, diagnosis or treatment.