Blog
The Caffeine Tracker blog.
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.
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Comparison
Read postThe 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.
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Guide
Read postHow 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.
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Guide
Read postWhat 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.
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Comparison
Read postDaily 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.
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Guide
Read postWhen 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.
Decide on that next coffee before it decides your night.
Free to download on the App Store.
