Bedtime estimate
See how many milligrams may still be with you at your usual bedtime, next to your bedtime target.
Track your caffeine, see what’s left at bedtime.
A 4 pm latte can still be with you at midnight. Log what you drink and Caffeine Tracker estimates how much may be left at bedtime, so you can enjoy your coffee and still sleep on time.
- Free to download
- iPhone
- iOS 18.0+
Features
What is Caffeine Tracker?
Caffeine Tracker is an iPhone app for logging coffee, tea, energy drinks, and other caffeine. From the drinks you log, the half-life you choose, and your usual bedtime, it estimates how much caffeine may remain when you go to sleep and shows the latest time another serving still fits your targets.
Your cutoff time
When another serving of a drink still fits your targets, see the latest time to have it.
2,000+ drinks
Search Starbucks, Dunkin’, Nespresso, Red Bull, Monster, and more by brand or category, or add your own.
Caffeine through the day
An interactive half-life chart shows your estimated caffeine level at any time of day.
A daily target that fits you
Start with a suggested daily amount based on your sensitivity and age, or set your own.
Habits over time
Statistics from 7 days to a year show your usual drinks and the hours you tend to have them.
Caffeine Tracker vs. counting a daily total
When you drink caffeine matters as much as how much.
Two coffees before noon and one at 5 pm can add up to the same daily total, but leave very different amounts in your system at bedtime. Caffeine Tracker shows both, using the drinks you actually log.
| Caffeine Tracker | Counting a daily total | |
|---|---|---|
| What it tells you | Daily total and bedtime estimate | Daily total only |
| When you drank it | Counted for every drink | Ignored |
| Caffeine per drink | 2,000+ drink variations | Your best guess |
| Your next coffee | A cutoff time when it still fits | No guidance |
How it works
From cup to bedtime estimate in three steps.
-
Set your bedtime
Enter when you usually sleep and pick a half-life. Use the suggested daily target or set your own.
-
Log the drink
Search by drink or brand, pick the serving, and record the time.
-
Check your evening
See today’s total and the bedtime estimate side by side, plus a cutoff when another serving still fits.
Is Caffeine Tracker free?
Yes. Caffeine Tracker is free to download from the App Store. Some features require a subscription or a one-time purchase for lifetime access.
How does Caffeine Tracker estimate caffeine at bedtime?
It uses the drinks you logged, the half-life you selected, and your usual bedtime. The result is an estimate for planning, not a measurement of caffeine in your body.
Which drinks can I log?
Coffee, tea, energy drinks, soda, shots, gum, and supplements from more than 2,000 variations, including Starbucks, Dunkin’, Nespresso, Red Bull, and Monster. You can also add your own.
Can I change my targets later?
Yes. You can change targets at any time, and the entries already in the journal stay there.
Is my caffeine log private?
Yes. Your setup details and caffeine log stay on your iPhone, and the App Store privacy label reads Data Not Collected.
Keep reading
From the blog.
Comparison
The 4 Best Caffeine Tracker Apps for iPhone in 2026
A look at the best caffeine tracker apps for iPhone in 2026, how caffeine builds up during the day, and which app fits what you want to change.
Read postGuide
How to Read a Caffeine Half-Life Chart
Read a caffeine half-life chart using a worked example. See why the curve falls gradually and how dose, time, and your chosen assumption change the estimate.
Read postGuide
What 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 post Decide on that next coffee before it decides your night.
Free to download on the App Store.
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