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Café OS

Brew Log

Record each cup's recipe and taste, then write down your next change — one variable, one direction. Stored only on this device; no account needed.

View as Markdown

A log is not useful because it is complete. It is useful because every cup leaves one decision behind: next cup, change one variable. Brew the next cup with that change, come back to “what you changed last time, and what happened”, and cause and effect slowly come into focus.

Not sure what to change? Diagnose it in Fix My Coffee first. To practise one variable systematically, run a Real Lab — lab records appear here too.

This log lives only in this browser on this device: no account, no upload. Clearing browser data deletes it too — export it now and then.

Log a cup

Cup tastes off? Diagnose it first

Save this cup

Only “Next change” is required (marked *). Record as much of the rest as you like.

Ratio

Fill in dose and water to compute it
What this cup changed from the last one

Taste

Each from 1 (very little) to 5 (a lot); leave blank if you did not notice.

Sweet
Sour
Bitter
Body

Explain the result in your own words. Doing so raises related concepts to “Explained”.

Next change: one variable only

Change one variable at a time: pick the variable, then the direction.

Stored only in this browser on this device. Never uploaded.

What you changed last time, and what happened

Nothing logged yet. Brew a cup, record it, and pick one variable to change next time.

Earlier cups (0)

None yet

Clear the brew log stored on this device? This cannot be undone — consider exporting first. (Concept mastery is not affected.)

Fix My Coffee

What is wrong with this cup? Name the symptom, check the suspects in order, then change one variable in a controlled experiment.

My Progress

Mastery of each concept, the predictions you wrote, the real labs you ran. Stored only on this device — no account needed.