Stop guessing when your booch is ready. FermLog logs every brew through first and second fermentation, so each batch is repeatable — and never accidentally turns to vinegar.
Open the tracker →F1 (first fermentation) is the open-air brew where your SCOBY and starter turn sweet tea tart. It usually runs 7–14 days depending on temperature; warmer rooms ferment faster. You taste it daily toward the end and pull it when it hits that sweet-tart balance you like — too short and it's syrupy, too long and it's sharp and vinegary.
F2 (second fermentation) is the sealed, bottled stage where you add fruit, juice or ginger and let it build carbonation, typically 2–5 days. This is where fizz and flavor happen, and it's also where bottles can over-pressurize if you forget about them. Tracking the F2 start date is the simplest way to avoid a sticky kitchen and get consistent carbonation.
The single most common kombucha mistake is losing track of time — a jar left two extra days at warm temperature can over-sour, and a forgotten F2 bottle can gush. FermLog gives every active brew a clear days-in counter and a target-ready estimate, with a progress bar that turns warm when you're past target. When a batch is perfect, mark it done with a rating and result note so next time you brew the same beautiful booch.
FermLog runs entirely in your browser — no account, no cloud, works offline at the brew shelf. Unlimited brews, check-ins and history are free. FermLog Pro adds a recipe library, CSV export, pH/taste trends and batch stats for rotation brewers.
Start tracking your kombucha →Also great for kimchi, sauerkraut, hot sauce and kefir. Free · private · offline.