A little coffee knowledge.
You know your favourite coffee. These guides help you understand what happens after you drink it.
How long does caffeine stay in your system?
What half-life means, how different cups add up, and why there isn’t one number for everyone.
When should you stop drinking coffee before bed?
A personal schedule, a caffeine estimate and the limits of what an app can tell you.
How we write these guides
Written by Quent La Brute, the developer of BeanFade. Health facts link to public sources, and examples are labelled. These guides explain caffeine tracking; they do not provide personal medical advice.