Mercus Hoffmann compiles the guides on Synapsis Coffee. The work is reading and organizing what has already been measured, not measuring it: extraction studies, roasting research, and the published literature on how caffeine behaves in the body.
The question the site keeps circling is an old one: why does the same bag of beans give a good cup on Tuesday and a flat one on Wednesday? The published answer is rarely mysterious. It is temperature, grind, time, ratio, and how steadily those were held. What this site does is put the numbers other people established in one place, in one format.
What this site is
Synapsis Coffee is a reference, not a magazine. Each guide starts from a published measurement and ends with numbers you can reproduce on your own gear. Every claim is attributed: the study, the roaster’s specification, or the manufacturer’s documentation it came from.
How the guides are built
- A brewing figure is published only with the temperature, grind setting, dose and time the source stated it at. Without those, it does not go in.
- Equipment is named. A grind size means nothing without the grinder it was measured on, so the source’s model is given.
- Caffeine content is kept separate from brewing preference. Metabolism figures come from published work on populations.
- Where sources disagree, both figures are given with their origin rather than averaged into a number nobody published.
What this site is not
It is not a tasting notebook. Mercus Hoffmann does not run sensory evaluations, does not own or bench-test the machines described, has not travelled to the origins profiled, and has never worked as a barista or a roaster. Nothing here is a verdict on how a coffee tastes.
It is not gatekeeping either: the guides cover cheap equipment and expensive equipment, because the published figures do. And it is not medical advice – the caffeine research cited describes populations, not you.
Reach the desk
Corrections are welcome and get acted on. If a number here does not reproduce on your setup, that is worth knowing: use the contact form and give your gear and your measurements.