notes for the next cup

Caffeine guides

Six short guides with sources and worked examples. Five are about caffeine and common drinks, and one shows how to use Onset.

The math

How long does caffeine stay in your system?

One 100 mg drink through the day, two coffees that overlap, and where a five-hour model falls short.

Timing

Research on dose and timing, plus worked examples for common drinks at 10 pm and 11 pm bedtimes.

Using Onset

A walkthrough of logging, previews, and Insights, with screenshots from an October 13 development build.

Drinks

Celsius next to Red Bull, Monster, Alani, and coffee, with the estimated amount left at 10 pm and 11 pm bedtimes.

Drinks

Cold Brew, Nitro, Vanilla Sweet Cream, and Iced Coffee by size, with the estimated amount left at 10 pm and 11 pm bedtimes.

Drinks

Diet Coke next to Coke and Coke Zero, bottle sizes, and what a three-can day adds up to by bedtime.

try it

Add your drinks and bedtime to the free calculator. No account needed.

from the studio

Why Onset works the way it does, what has shipped, and what I still want to learn.

These guides are general information, not medical advice.