iPhone & iPad · Free
The Ultimate Caffeine Tracker App in 2026
Caffeine Tracker: Sleep Better is the free way to see how much caffeine is still in your body — and the latest you can have coffee without ruining your sleep. No account, no ads.
Features
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Live body caffeine
Not just what you drank — what's still in you right now, plotted as a decay curve running out to bedtime.
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Your last safe coffee
A cutoff time tuned to your sleep target, so you know whether that 3 PM cup is fine or the reason you're staring at the ceiling.
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A limit that fits you
Your daily ceiling is anchored to FDA guidelines and adjusted for your age and caffeine sensitivity.
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Photo, barcode or voice
Log from a picture, scan the can, or just say what you drank. AI does the first pass and you confirm before anything saves.
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Fix the time, fix the math
Logged that coffee an hour late? Edit any entry's time and the whole decay curve and cutoff recalculate instantly.
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Yours, on your device
Everything runs locally. No accounts, no data collection, no ads.
Screenshots
Pick from a curated library of coffee, tea, energy drinks and soda — or use a photo, barcode or your voice, and review the result before it saves.
Caffeine per serving across coffee, tea, energy drinks and soda, so the 200 mg surprises stop being surprises.
How it works
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Set your limit and bedtime
Enter your age, sensitivity and target sleep time. The app sets a daily ceiling from FDA guidelines and works out your cutoff.
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Log what you drink
Search the library or capture it by photo, barcode or voice. Each entry drops onto your decay curve at the time you had it.
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Watch the curve
See live body caffeine fall through the day and check whether you're clear before bed — or whether one more is a bad idea.
FAQ
Frequently asked questions
Is Caffeine Tracker free?
Yes. The app is free to download and use, with no ads and no account required.
How does it know how much caffeine is still in my body?
It models caffeine decay from when you logged each drink. Caffeine has roughly a 5-hour half-life, so the app plots what remains as a curve rather than just totalling what you drank.
What is the "last safe coffee" cutoff?
It's the latest time you can have caffeine and still be low enough at bedtime for it not to interfere with sleep. It's calculated from your sleep target and your current levels, so it moves as your day does.
Why does the time I drank something matter so much?
Because caffeine leaves your system gradually. With a 5-hour half-life, a 3 PM cup can still be meaningfully present at midnight — the timing affects your sleep far more than the total does.
How is my daily limit set?
It starts from FDA guidance and is adjusted for your age and your self-reported caffeine sensitivity, so it isn't the same generic number for everyone.
Can I log drinks other than coffee?
Yes. The library covers coffee, tea, energy drinks, soda and more, each with caffeine content per serving.
Can I log from a photo or barcode?
Yes. You can log from a photo, a barcode scan or your voice. AI does the first pass and shows the result for you to review and correct before saving.
What if I log something at the wrong time?
Edit the entry's time and everything recalculates immediately — the decay curve, your current level and your cutoff all update.
Does it reward staying under the limit?
Yes. You build a streak, earn XP and unlock 44 achievements for staying under, with daily, weekly and monthly challenges that reward moderation and earlier cutoffs.
Do I need an internet connection or an account?
No account is ever required and your data stays on your device. AI photo, barcode and voice logging need a connection; the drink library and manual logging work offline.
Does Caffeine Tracker work on iPad?
Yes. It runs on both iPhone and iPad.
Is this medical advice?
No. Caffeine Tracker estimates caffeine levels from what you log using a standard half-life model — it isn't a medical device and can't account for everything that affects your individual metabolism. Treat it as a guide, not a diagnosis.
Know when to put the cup down.
Download Caffeine Tracker and stop guessing why you're awake at midnight.
Free Caffeine tools
- Caffeine Half-Life & Sleep CalculatorA caffeine half life calculator for bedtime. Enter how many mg you had, when you had it and when you plan to sleep, and see how much caffeine is still in your system at bedtime, the share of the dose that is left, and when it falls to 50 mg.
- Caffeine Withdrawal Timeline PlannerMap a gradual caffeine reduction from your current daily intake to a day-by-day target, with common caffeine withdrawal windows shown alongside each date.
- Caffeine in Chocolate CalculatorChoose a chocolate type and enter a serving size to estimate the caffeine in that chocolate serving.
- Coffee Caffeine CalculatorPick your brew method and cup size to see how much caffeine is in a cup of coffee — the total mg, the mg in a standard 8 fl oz serving, and how much of the FDA's 400 mg daily guidance that uses. Typical values, not a measurement of your specific cup.
- Coffee to Water Ratio CalculatorFind how much grounds per cup of coffee you need, with grams, approximate tablespoons, water and a 1:n ratio for your brew method.
- Daily Caffeine Limit CalculatorSee how much caffeine you can have a day according to published guidance for your life stage, with an adult weight-based single-dose figure and drip coffee equivalent.
- Energy Drink Caffeine CalculatorChoose a brand and product, then enter the number of cans or shots to estimate total caffeine, caffeine density and the share of the FDA 400 mg daily figure.
- Espresso Caffeine CalculatorWork out how much caffeine is in an espresso shot: choose how many shots you pulled, how you pulled them and which beans went in. You get the total in mg, the mg per shot and how much of the FDA's 400 mg a day it uses.
- Half-Life Formula CalculatorEnter a starting amount, half-life and elapsed time or target amount. See the remainder, decay table, curve and worked formula for any substance.
- Matcha & Tea Caffeine CalculatorEstimate how much caffeine is in matcha green tea and other teas from powder weight or brewed serving size. See the result in mg and as a share of the FDA 400 mg daily figure.
- Soda Caffeine CalculatorEstimate total caffeine intake from soda servings using typical caffeine values for common soft drinks.
- Yerba Mate Caffeine CalculatorEstimate yerba mate caffeine from the amount of dry leaf, water volume and number of servings. Results are typical estimates, not exact measurements.
From the blog
All articles →- Does green tea have caffeine? Every tea type in mgDoes green tea have caffeine? Yes, 20 to 50 mg per cup. Compare green, black, white, oolong, chai, matcha and the herbal teas with none.
- Does matcha have caffeine? How much, and how it comparesDoes matcha have caffeine? Yes — about 38-88 mg per teaspoon, more than steeped green tea. How it compares to coffee, and what L-theanine changes.
- How much caffeine in a shot of espresso (and every milk drink)How much caffeine in a shot of espresso: about 63 mg for a single, 125 mg for a double — plus the shot-count math for lattes, pods, and Starbucks.
