Dial Your Shot is a free espresso dialing tool that helps you tune every parameter of your shot - dose, yield, grind size, extraction time, brew temperature and pressure - and get instant flavour feedback.
Rate your shot as sour, bitter, fruity, watery or harsh, and the app suggests exactly what to adjust next. Whether you are a beginner or an experienced home barista, Dial Your Shot gives you a clear path to your perfect espresso.
This tool corrects the recipe: grind, ratio, time and temperature. It cannot see your puck. If the dose was uneven, the grounds were clumpy or the tamp was tilted, water rushes through the weakest part of the coffee bed - that is channeling - and the same shot tastes sour and bitter at once. Grinding finer will not fix that. It is a preparation problem, and it has to be solved at the machine.
That is why the workflow comes first. Pull every shot the same way - same warm-up, same weighed dose, same WDT and level tamp, stopped on the scale by weight - and the only thing that changes between two shots is the one variable you chose to change. That is when the corrections here become reliable. If you saw spurts or a lopsided stream, open Show all settings and set Distribution to Uneven so the analysis accounts for it.