a caffeine coach
know when to stop.
Caffi tracks every drink, models how caffeine moves through your body, and tells you when to put the cup down so you sleep tonight. Editorial design. Gentle nudges. No nagging.
iPhone, iOS 18+. Free to use.
how it works
three ways Caffi makes you smarter about caffeine.
LOG
every drink, in seconds
Tap a favorite or browse a catalog of 30+ drinks. Custom logging for the weird stuff. Each entry mirrors to Apple Health automatically.
SEE
caffeine on a curve
Watch your real-time load rise and fall. The model uses a 5-hour half-life and your bedtime to flag when the cup you're about to drink will eat into deep sleep.
ASK
a coach that gets it
Bean is a GPT-5-powered coach that knows your day's intake and goals. Ask 'when should I stop?' or 'why am I jittery?' and get a real answer, not a Wikipedia paste.
your ritual, on your terms.
Caffi never sells your data, never spams notifications, and never lectures you about cutting back unless you ask.
get Caffi for iOS →