Vurr predicts your grind setting before you pull — using extraction physics, roast profile, bean freshness, and live weather data. Not AI. Not generic advice. Scan a coffee bag. Apple Vision reads the label on-device. The engine outputs a grind number with a confidence tier and a “Why?” breakdown showing exactly what moved it. Cold start on a new bag: drinkable range on pull 1 or 2 instead of pull 8. 49 grinders. 19 brands. 14-day free trial.