The coffee quiz.
869 questions in 27 categories, from botany to cost price. A ten-question skirmish, a dungeon up to a hundred with three lives, a quest on a theme, the daily quest. Ranks, achievements and scores stay in your browser.
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The variety atlas
272 dossiers linked to their parents. Click a name and its lineage lights up: what is documented, what is probable, what DNA has contradicted.
Explore the atlas
The water calculator
Your hardness and alkalinity targets, the magnesium share, the sodium. It returns the salts to weigh to the nearest tenth of a gram and places your water in the SCA and SCAE zones.
Open the calculator
The 21 topics.
472,000 words, 1,070 sources. From the coffee plant to the cup, in any order.
A drupe, two seeds, four species; the cross section of the cherry and Köhler's plate.
272 dossiers linked to their parents, with what is documented, what is probable, and what DNA has contradicted.
Coffea canephora is a species, not a variety: its lineages, its clones, its real place in the world.
Coffee leaf rust, the berry borer, coffee wilt disease: what attacks the coffee plant and why resistance is never permanent.
Six journeys on the world map, from Yemen to Boquete.
287 dated landmarks, from the original hybridization to 2026, each with its source, legends included.
93 producing countries and territories, profile by profile: history, varieties, processes, calendar, institutions.
Washed, natural, honey process, wet hulled, anaerobic, carbonic maceration, MOX (micro-oxygenation): what is measured and what is not.
Seven centuries of machines, the chemistry of the bean, technologies compared and the roaster's tools.
What ions do to extraction, the standard, and a calculator that gives the salts to weigh.
From decoction to espresso: each method, its parameters, its filters and its grinders.
What we taste, how we name it, how the trade scores it, and where defects come from.
How the world drinks its coffee, from the Arab ceremony to the cafés of Vienna and New York.
Chicory, molded beans, lead glazing: the golden age of fraud, the laws, and fraud today.
Where the price comes from, where it is decided, who collects it: the exchange, certifications, the producer's share.
The molecule, its established effects and those that are not, decaffeination and instant coffee.
The cherry delivers only 1 to 5% of its mass: where the rest goes, and what is done with it.
Climate, genetics, forgotten species, regulation: what coffee is going to become.
The viewpoints.
Three signed texts, written in my name. They are a practitioner's points of view: they do not replace the sourced plates, they say where the person who built them is speaking from.
Article, 2026What goes unsaid about the price of specialty coffee
For a long time, I believed that the price of specialty coffee was a matter of quality. The better it is, the more it costs, the more of it goes back to the producer.
ReadHabits, cultures and the transmission of tasteThe coffee we think we already knowThere are products we discover, and others we think we already know.
ReadWhat really changes when the scale changesGrowing without burningGoing from a few kilos to a few tonnes changes more than the machines: it changes what you can still promise.
ReadArticle, 2026The counter is a stageThe same establishment that refuses an automatic coffee machine has, eight meters away, a kitchen stuffed with automation that nobody finds degrading.
ReadThe tools.
They work offline and transmit nothing: everything stays in your browser.
Barista Pocket
The recipe, then the diagnosis that starts from the defect in the cup.
OpenMission and ConstraintThirty counter cases, five levers, and what each one costs.
OpenAuto machineSetting up an automatic machine with a grinder, symptom by symptom.
OpenThe water calculatorTwelve profiles, the salts to weigh, the zone reached.
OpenSearch 472,000 words.
A word, a country, a variety, a molecule: the search goes down to the paragraph.