Caffe-in

Caffe-in estimates the caffeine, taurine, and L-theanine levels in your blood in real time, using a precise pharmacokinetic model based on the actual half-lives of each substance.
Add your drinks as you go (coffee, tea, energy drinks, etc.) and observe how the levels change hour by hour. Caffe-in helps you better manage your consumption and avoid excess.

Features:

Real-time calculation of caffeine, taurine, and L-theanine in the blood
More than 15 predefined drinks (espresso, green tea, Red Bull, Monster, etc.)
24-hour trend graph
Visual gauge for each substance
Consumption history
Customizable favorite drinks
Interface in French and English
No account required, data stored locally

Available in a free version. The full version unlocks unlimited favorites, an extended 7-day history, and a 1-year overview.