CaffeinDiary: Caffeine Tracker

CaffeinDiary is a simple caffeine tracker that helps you log your daily caffeine intake and review its relationship with your sleep.

Easily record caffeine from coffee, tea, energy drinks, cola, supplements, and more, then check at a glance how much caffeine you have consumed today.

By combining your daily caffeine log with Sleep OK / Sleep NG records, you can compare the days you slept well with the days you did not sleep well, and find your own “caffeine line for better sleep.”

“I want to understand why I couldn’t sleep well.”
“I want to manage my coffee and energy drink intake.”
“I want to find a caffeine amount that works for me.”

CaffeinDiary is made for anyone who wants a simple way to track caffeine and reflect on sleep habits.

This app is not about forcing strict limits or telling you to quit caffeine.
It helps you understand what amount and timing may affect your sleep, so you can build a healthier relationship with caffeine at your own pace.

Main Features

・Log caffeine intake
・Record coffee, tea, energy drinks, cola, supplements, and more
・Quickly log your favorite drinks
・Create custom drinks
・Record Sleep OK / Sleep NG
・Review daily, weekly, and monthly records
・Compare caffeine intake and sleep
・Export JSON backup

Recommended for people who:

・Drink coffee or tea often
・Want to manage energy drink intake
・Are worried about consuming too much caffeine
・Want to review why they sometimes cannot sleep well
・Want to find a caffeine amount that works for them
・Want to improve sleep habits
・Want a simple daily habit tracker

CaffeinDiary is not a medical app.
It is not intended for medical diagnosis, treatment, or medical advice. It is a record-keeping app for reviewing daily caffeine intake and sleep.
If you have concerns about your health or physical condition, please consult a doctor or other healthcare professional.

Recent changes:
Added support for Android 16. Improved the logging experience and fixed minor issues.