About the site
How we make JayArr Coffee
JayArr Coffee started as a YouTube channel in 2019. The site adds written guides and interactive tools. Here is how they are put together.
Where the numbers come from
The tools calculate from published methods and measurements, not from guesses. Brew recipes are scaled from named methods, such as Jessica Easto's V60 and Chemex recipes or an espresso recipe within Scott Rao's published ranges. Extraction and strength follow the Specialty Coffee Association's brewing control chart. Caffeine guidance uses the FDA's, EFSA's and ACOG's own wording. Every tool lists its sources on its page.
When a figure is an estimate rather than a measurement (how much caffeine a particular cup holds, how fresh a bag is, where a cup sits between sour and bitter), the tool says so and shows a range instead of a single number.
The core references:
- Jessica Easto, Craft Coffee: A Manual (2017).
- Jonathan Gagné, The Physics of Filter Coffee (2021).
- James Hoffmann, The World Atlas of Coffee (2nd ed.) and published brewing technique (2018).
- Scott Rao, The Professional Barista's Handbook; Espresso Extraction.
- Specialty Coffee Association, Coffee Brewing Control Chart, revised March 2019 (Version 3) (2019).
- Specialty Coffee Association, Water quality standard for brewing.
- Barista Hustle, Water recipes and the two-bottle concentrate method.
- U.S. Department of Agriculture, Agricultural Research Service, FoodData Central, SR Legacy, FDC ID 171891: Beverages, coffee, brewed, espresso, restaurant-prepared (2018).
How articles are written and dated
- Articles cite the books, studies and maker pages they rely on, in a Sources section at the end.
- Product facts come from the maker's published specifications and carry the date we checked them. Prices change, so we don't print them as fixed figures.
- Articles that accompany an older video keep that video's original date. When we substantially revise an article, it shows the date of the revision; small fixes don't change the date.
Corrections
If something is wrong, tell us at jay@jayarr.coffee. We check it against the sources, fix it, and update the revision date.
Affiliate links
Some links go to Amazon, and JayArr Coffee earns a commission on qualifying purchases at no cost to you. A link to a specific product goes to that exact product; a link that opens an Amazon search says so. Recommendations come from what fits the reader's need, and every guide includes options for improving what you already own. More in the affiliate disclosure.
What stays private
What the tools save, such as your caffeine diary, stays on your device. The tools keep their current settings in the page's address so you can share them, and the page views our setup sends Google Analytics leave those settings out. A share link is only made when you press Share. The privacy policy lists what each tool keeps and what Google Analytics records.