Guides

Brewing guides.

Written to be used at the brewer rather than read once. Each one takes a single question and answers it properly.

Brewing

Method How to dial in a V60 Sour or bitter? Change one variable at a time, read the drawdown, and fix it in the right order. Recipe The 4:6 method, explained Kasuya's competition recipe: the first 40% sets sweetness, the last 60% sets strength.

Knowing your coffee

Reference How to read a coffee bag label Every field explained, ranked by how much it actually changes your brew. Reference Washed, natural and honey What processing does to the cup, and how to adjust grind and temperature for each. Reference How long does coffee last? Resting, peak, and why opening the bag starts a much faster clock. Reference Roast date vs best before Which date to trust, how to decode lot codes, and what a missing date tells you.

Start here, by problem

The problem	Where to go
"It tastes sour" or "it tastes bitter"	V60 dial-in
"It tastes fine but weak"	Brew ratio calculator
"What grind setting for my grinder?"	Grind charts, 18 grinders
"What do these words on the bag mean?"	Reading a bag label
"Is this bag too old?"	How long coffee lasts
"Nothing I change makes any difference"	Probably the beans, not you

In the app

Coffee Aeye applies all of this to the specific bag in your hand — scanned off the label, matched to recipes that suit it, with the grind quoted in your own grinder's numbers and a rating that turns into a concrete next move. All on-device. Get it on Google Play — €4.29, one-time, no subscription.