Log in seconds
Use familiar drink presets or enter caffeine directly in milligrams.
CAFFEINE, MADE VISIBLE
Coffee now.
Caffeine at bedtime?
Log your coffee, tea, or energy drink. See estimated caffeine at bedtime and preview your next cup before adding it to your log.
Estimated remaining
48 mg
NowBedtime
Follow the trace
See a half-life-based estimate that includes caffeine carried over from earlier drinks.
Plan for bedtime
Get an estimated cutoff time based on your bedtime, reference drink, and preferred threshold.
A CLEARER MODEL
Useful estimates, honestly explained.
CaffTrace uses a simple exponential half-life model. Each logged dose decreases independently over time, then the estimates are added together.
These values are not measurements, diagnoses, or medical safety limits. Metabolism varies, and the model does not reproduce absorption or actual blood concentration.
PRIVATE BY DEFAULT
Your caffeine log stays on your device.
No account and no first-party tracking server. CaffTrace stores your drinks and settings locally. Version 0.2.0 uses Unity LevelPlay and Unity Ads with personalized-advertising consent declined. See the policy for provider data handling and older versions.
Read the privacy policy →