FermLog is a free, private logbook for home fermenters. Track every batch from the day you pitch your starter to the day it's perfectly sour — no spreadsheet, no account, no cloud.
Open FermLog →Fermentation is a slow, living process, and the difference between a great batch and a flat or moldy one usually comes down to small details you forget by next time: how much starter you used, the salt percentage of the brine, when bubbles first appeared, how the taste changed day to day. A fermentation log turns those one-off guesses into a repeatable recipe. When a batch comes out perfect, you'll know exactly how to do it again — and when one goes wrong, you'll have the timeline to figure out why.
Everything you log stays in your browser using local storage. There's no sign-up, no server, and nothing to leak. It works offline on your phone in the kitchen, and you can back up or restore all your data as a single JSON file whenever you like.
Unlimited batches, check-ins, history and ready-date estimates are free forever. FermLog Pro is a one-time unlock that adds a clone-able recipe library, CSV export, pH and taste trends, and batch stats — for serious fermenters who brew on rotation.
Start your fermentation log →Free · private · works offline · no account required.