Kohii — the barista log
A brew journal for people who dial in. Espresso, pour-over, AeroPress, moka and cold brew, all logged offline.
Free to download · one-time unlock · no subscription
Most coffee notes live in three different places at once — a note on your phone, a photo of a bag, and whatever you can remember about the grind setting you were on last week. Kohii exists because a dial-in only converges if you can see what you changed last time.
What it does
- Log dose, yield, time, grind and a live brew ratio for every cup
- Every method — espresso, V60, Chemex, AeroPress, moka, French press, cold brew
- Rate acidity, bitterness, sweetness and body, then one-tap “Brew Again” your best shot
- Track beans by roaster, origin and roast date, with freshness worked out for you
- Fully offline, no account, one-time unlock
Why logging a brew changes the coffee
Dialling in is a search problem. Three variables move the cup — the ratio of coffee to water, the grind, and the contact time — and each one pulls the others around. Change two at once and you learn nothing, because you cannot attribute the result. Change one, write down what you did, and taste: that is the whole method, and it works far faster than any amount of reading.
The awkward part is that it depends on remembering yesterday. A shot that ran sour at 18 g in and 36 g out over 22 seconds tells you to grind finer, but only if you can recall those numbers exactly. That is the entire reason a brew log exists, and why a bag of expensive coffee is often wasted on rediscovering something you had already worked out a fortnight earlier.
Freshness is a variable too
The other thing a log surfaces is that beans move under you. Coffee needs to rest after roasting — roughly ten days for espresso, less for filter — and it then holds a peak for a few weeks before the aromatics fade. A recipe that was perfect on day fourteen will taste flat on day fifty, and if you are not tracking the roast date it looks like your technique regressed. It did not; the coffee got older. Kohii tracks that from the roast date, and there is a free coffee freshness calculator here if you just want to check a bag.
Offline, because a kitchen is not a spreadsheet
Everything lives on your phone. No account to make, no sync to fail, nothing to lose when a service shuts down — and it works fine in a cafe basement with no signal.
Free tools on this theme
- Coffee Ratio CalculatorCoffee-to-water ratios for every brew method.
- Espresso Ratio CalculatorDose, yield, ratio — enter any two, solve the third.
- Coffee Freshness CalculatorRoast date in, peak drinking window out.
Privacy
Kohii stores everything on your device. There is no account, no server and no cloud sync, and nothing you enter is transmitted anywhere. Read the full privacy policy.