Who publishes this site
CupTune is published by CupTune, under that name alone; no individual is named as an author on any page. To reach the publisher, use the contact page, which goes to support@cuptune.com. The about page explains why the site exists and what it deliberately leaves out.
Where the numbers come from
A number on CupTune is one of two kinds. Some come from a published primary source: a standards body, a peer-reviewed study, a regulator or a manufacturer’s own instructions. Those pages link the source beside the sentence that uses it, so you can read it yourself.
The rest are CupTune’s authored starting points: recipe doses, ratios, water temperatures and timings, grind ranges and bean freshness bands chosen as a reasonable place to begin. They are labelled as CupTune’s own, and the method page sets out the formulas that turn them into the figures the tools show. An authored starting point is not a standard, not a measurement of your coffee and not a promise about how a cup will taste.
How a page is written and checked
Pages are drafted with AI assistance and then checked before they ship. The checks are mechanical and run on every change to the site:
- The claims ledger. Each factual claim is recorded in a claims ledger with the primary source it rests on or the internal record behind it, and a check on every change refuses a claim whose exact wording is no longer on the page or whose review-by date has passed.
- The recipe validator. Every recipe must run in the timer: the test suite validates each authored recipe’s steps, masses and times and fails if one does not end at its declared total time. A recipe that cannot be brewed step by step does not get published.
- The calculators. Each formula has tests that pin its arithmetic, including the inputs it must refuse.
- Repetition checks. Before a release, the visible text of every pair of indexable pages is compared, and the release is held while any pair overlaps by more than 22 %.
These checks are about consistency, sources and arithmetic. They are not a tasting panel, and CupTune does not claim that anyone brewed a recipe before it was published; your grinder, beans and water decide the cup.
What money does not buy
There is no paid placement on CupTune, and there are no affiliate links today. No brand pays to have a brewer, grinder, recipe or method included, ranked or described. When a page names equipment such as a V60, a Chemex or an AeroPress, it is to say which brewer a recipe is written for; the drawings are generic, and CupTune is not affiliated with those makers.
If advertising is switched on, it will sit in separate ad spaces after the content, never inside a recipe card, the brew timer or the journal, and advertisers have no say in what a page says.
Corrections
If a figure looks wrong, write through the contact page and name the page and the figure. It is checked against its cited source or its formula. If the page is wrong it is corrected, and the review date recorded for that claim moves to the day of the fix. If the page is right, the reply says which source or formula it rests on.
Your data is not editorial material
Nothing you type into CupTune is used to write or test a page. Recipes you save, brew records, bean notes and tasting scores stay in your browser, as the privacy page describes, and the site has no way to read them.