About
A calm record of your coffee
Bunchum is a calm, precise place to record your coffee and understand it better. The name comes from the physician al-Rāzī, who described coffee around 922 CE in the earliest known medical note on the bean. He worked the way Bunchum works.
From Beans · two entries, the same row
Four rules it holds to
The rules behind it
Your notes stay yours. Everything you log exports at any time, in a format you can keep, and you decide what happens to it. That is the whole promise: a calm, precise record of your coffee, owned by you.
Coffee to beverage ratio
1 : 14.715 g coffee · 250 g water · 30 g stays in the bed · 220 g beverage
Extraction yield
19.1%220 g beverage × 1.30 % TDS ÷ 15 g
14 %typical 18–22 %26 %
Within the typical range
TDS measured with a refractometer, beverage weighed.
From Brewing · rule 03, recomputed
Questions
Is it free?Open the answer
Yes. In Solo mode Bunchum is free, with no account fee and no usage cap. Your export comes as CSV or JSON, produced in one pass, with no detour through someone else's storage.
Who is it for?Open the answer
People already at home in specialty coffee: you own a grinder, you weigh your dose, 15.0 g and not thereabouts, and you want to see what changes from cup to cup. If that is not you yet, the Guides are a place to start.
Do I need special gear?Open the answer
A grinder, a scale and one brewer are enough; Bunchum speaks in your grinder's numbers, not a stranger's. A refractometer is needed only for the 19.1 % above: without measured TDS the yield stays empty instead of being guessed.
What about my data?Open the answer
They stay yours. Bunchum does not sell them and shows no ads against them. Ask for deletion and 30 days run, in which you can take it back; after that the record is gone.
For the curious
Curious about coffee?
Bunchum keeps a small library of Guides, written to read for the pleasure of it. Short, sourced pieces on brew methods, origins, and the science in the cup, made to share the love of specialty coffee. No account needed.