SHOT RECEIPT / AWAITING TASTE
18g in36g out30seconds
- Brew ratio
- 1:2.00
- Average flow
- 1.20 g/s
- Taste report
- Sour
Print the next move when these measurements match the shot you tasted.
SHOT LAB / ONE VARIABLE AT A TIME
Your next shot,
itemized.
Record what happened. Run one controlled change. Report Better, Same, or Worse—and let the outcome choose the next evidence-backed experiment.
18.0g36.0g30s
THE RULE
Change one thing.Hold the rest.
- Time
- Flow evidence
- Taste
- Your observation
- Outcome
- Adaptive next experiment
THE WORKBENCH
Turn the cup into a useful next test.
If you saved an equipment receipt, Shot Lab restores that machine and grinder locally. Optional coffee and grinder-setting labels stay in your browser; no account or free-text tasting diary is required.
LOCAL SHOT ROLL
Compare the experiment, not the memory.
Save a diagnosis to start a private, account-free history.
NO SAVED SHOTS
Your first saved shot will appear here with its measurements and next controlled test.
THE DIAGNOSTIC CONTRACT
Measured enough to learn.
Honest enough to stop.
Thirty seconds is a coordinate, not a verdict.
Time becomes useful when dose and beverage mass are measured consistently. It does not prove evenness, extraction yield, or whether you like the coffee.
A better cup should teach you why.
The receipt selects one next change and prints the variables to hold constant. Better, Same, or Worse then determines whether to keep, remove, or redirect that change.
Your observation stays labeled as yours.
The tool can calculate ratio and average flow. It cannot see the puck, measure dissolved solids, certify the machine, or detect channeling from a checkbox.
START WITH WHAT YOU TASTED
Five symptoms. Five different first moves.
Each guide gives the direct answer first, explains what the measurements can and cannot establish, and opens Shot Lab with the relevant observation preselected.
01 / SOURWhy your espresso tastes sour—even at 30 seconds
A measured way to diagnose sour espresso without treating 30 seconds as a guarantee or changing every variable at once.
Open the field guide →02 / BITTERHow to fix bitter or harsh espresso one change at a timeUse flow, time, yield, and roast context to choose a controlled next experiment for bitter espresso.
Open the field guide →03 / CONFLICTING SIGNALSWhen espresso tastes sour and bitter at the same timeWhy conflicting flavors point to an evenness check before another blind grind adjustment.
Open the field guide →04 / FAST FLOWEspresso shot running too fast: the next useful testA fast shot usually calls for more resistance, but only when dose and yield are measured and preparation is repeatable.
Open the field guide →05 / SLOW FLOWEspresso shot running too slow or stallingReduce resistance with one controlled coarser-grind test while holding dose and beverage yield constant.
Open the field guide →EVIDENCE LEDGER
The source does not get to claim more than it measured.
Research findings, manufacturer guidance, practitioner frameworks, and standards context remain visibly separate. None of them is presented as a physical test by Espresso Receipt.
- peer-reviewedSystematically Improving Espresso: Insights from Mathematical Modeling and ExperimentMatter / University of Huddersfield research portal · checked 2026-07-22
Supports the nonuniform-flow warning at very fine settings; it does not diagnose an individual puck.
- peer-reviewedInfluence of Flow Rate, Particle Size, and Temperature on Espresso Extraction KineticsFoods · checked 2026-07-22
Supports interactions among flow, particle size, temperature, and brew ratio; it does not provide a universal sensory recipe.
- manufacturer-guidanceDialing In Made EasyRancilio Group North America · checked 2026-07-22
Supports recording dose, beverage mass, time, and taste and using grind as a controlled lever; its time bands are reference bands, not pass-fail standards.
- practitioner-frameworkThe Espresso CompassBarista Hustle · checked 2026-07-22
Supports separating strength, extraction, yield, and evenness; it remains a practitioner framework rather than an individual measurement.
- standards-bodySpecialty Coffee Association standardsSpecialty Coffee Association · checked 2026-07-22
Provides standards context only. Espresso Receipt does not perform or imply SCA certification testing.