Log the serving in front of you
Search the catalog, pick a recent drink, or add a custom item. Choose the size, adjust the amount, and record when you had it.
Log caffeine and estimate what remains at bedtime
Caffeine Tracker - Kofe
Add the drink, the serving, and the time you had it. Caffeine Tracker uses those entries, the half-life you select, and your usual bedtime to estimate what may still be left that night.
Health & Fitness
01Search more than 2,000 drink variations
02Compare intake with your daily target
03Estimate caffeine remaining at bedtime
04Keep the log on your iPhone
Why it helps
A daily total and a bedtime estimate answer different questions.
The same number of milligrams can sit under a daily limit and still leave a large estimate at bedtime if you drink it late. Caffeine Tracker keeps both figures visible, using the drinks you actually log.
Read the two targets separately
The home screen compares what you have consumed with your daily target, and the bedtime estimate with the bedtime target you set.
Review the longer pattern
Statistics cover 7 days, 30 days, 3 months, or 1 year, including totals, bedtime estimates, frequent drinks, and timing by hour or weekday.
How it works
From a drink to a bedtime estimate.
Set the assumptions
Enter your usual bedtime and a half-life. Use the suggested daily target, or replace it with your own. The suggestion can reflect sensitivity, age, and, where it applies, pregnancy or breastfeeding.
Add the drink
Search or browse by category and brand. Select the serving, adjust the quantity, and record the time. The add screen shows an estimate for that serving.
Check the day
Compare both targets on the home screen and inspect the half-life chart. If another serving of a logged drink fits both targets, the app can show an estimated cutoff time.
Blog
Notes from the blog.
caffeine half-life
What Caffeine Half-Life Means
Caffeine half-life is the time it takes to clear about half of a dose. In healthy adults the average is about 5 hours, with a range of roughly 1.5 to 9.5 hours.
Read post when to stop caffeine before bedWhen to Stop Caffeine Before Bed
There is no single cutoff for every dose and person. Use your bedtime, the size of the drink, and a study of 400 milligrams taken 6 hours before sleep.
Read post daily caffeine limit vs caffeine at bedtimeDaily Caffeine Limit vs Caffeine Left at Bedtime
A 400 milligram daily figure and the caffeine still present at bedtime answer different questions. You can stay under the daily total and still drink late.
Read post what to look for in a caffeine trackerWhat to Look for in a Caffeine Tracker
Choose a caffeine tracker by the drink log, the editable half-life and bedtime, on-device storage, and a clear line around what the app does not measure.
Read postFAQ
A few common questions.
What does the bedtime estimate use?
It uses the drinks you logged, the half-life you selected, and your usual bedtime. It is an estimate, not a measurement of caffeine in your body.
Can I change a target later?
Yes. You can change targets at any time, and the entries already in the journal stay there.
Which drinks can I log?
You can log coffee, tea, energy drinks, soda, shots, gum, supplements, other catalog items, and custom items you create.
Does Caffeine Tracker track sleep or use Apple Health?
No. It does not read Apple Health, track sleep, or sync the log through iCloud. Setup details and caffeine logs stay on your iPhone.
Available on the App Store
Check the bedtime estimate before you add another drink.
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