See what may remain
Track today's intake and a per-drink estimate of caffeine that may still be in your system.
A caffeine tracker with a memory
The cup is empty.
The caffeine isn't.
Log coffee, tea, or an energy drink. CaffOut estimates what may still remain using a transparent half-life model, then turns the day into a private coffee journal.
No account. No subscription. Your drink history stays on your device.
4:12 PM coffee
may still echo at bedtime
may still echo at bedtime
ESTIMATE
NOT A DIAGNOSIS
NOT A DIAGNOSIS
Local-firstCore data stays on device
TransparentFormula and inputs are visible
No subscriptionOptional lifetime Stamp unlock
Built for the last cup
Useful numbers. A journal you'll want to keep.
Log now, complete later
Save a drink quickly. If the caffeine value is unknown, CaffOut leaves it visibly incomplete until you add it.
Remember the day
Turn a photo into a private Stamp, add an optional place, and watch your journal build over time.
The honest version
See the estimate, and the assumptions.
CaffOut estimates each drink separately with a configurable caffeine half-life, then adds the remaining amounts. It is a reference model, not real-time body monitoring or medical advice.
Read the formula and limitationsFor each drink
remaining = intake × ½(elapsed ÷ half-life)Your settings are inputs to a model. They are not measurements of your metabolism.
Private by default
Your coffee journal belongs on your phone.
CaffOut has no required account, developer cloud-sync service, advertising SDK, or behavioral analytics SDK.
Read the plain-language privacy policyQuick answers
Before you download
What is CaffOut?
CaffOut is a local-first caffeine tracker and coffee journal for iPhone and iPad. It records drinks, estimates possible remaining caffeine, and turns photos and places into private drink Stamps.
How does the caffeine estimate work?
CaffOut estimates each drink separately with a configurable half-life model, then adds the remaining amounts. The formula and assumptions stay visible in the app.
Does CaffOut upload my photos or drink history?
No developer account or sync service is required. Drink history, settings, saved places, and custom Stamp images stay in the app's private on-device storage by default.
Is CaffOut a subscription?
No. The core experience is free. An optional one-time purchase unlocks unlimited custom Stamps.
CaffOut for iPhone and iPad