01
The concept
Krausen is a homebrewing fermentation tracker that replaces the spreadsheet. Drop in a gravity reading from your phone in thirty seconds; an AI reads the curve, predicts your final gravity and packaging date, and emails you a weekly batch digest. No dashboard, no app — just useful email when your batch needs attention.
02
Where it stands
This entry preserves the idea in the lab index; its current market case has not been refreshed.