If your coffee comes out with a sharp, hollow acidity — no sweetness, no body — it is almost always under-extraction. This guide walks through the causes ordered by frequency and shows you how to fix each one without changing everything at once.
Grind and ratio get all the attention, but temperature is the variable that lets you fine-tune espresso once everything else is dialed in. Understanding its effect—and its sensory asymmetry—can transform a technically correct shot into one with real character.
Roast level is not just about color or intensity: it determines the chemical composition of the bean and, with it, how coffee extracts. Understanding its effects lets you calibrate any brewing method with far greater precision.
Simulator · Espresso · V60 · French Press · AeroPress · Moka · Cold Brew · Sensory Profile
Indicative prediction based on extraction theory. Ideal for understanding how variables affect acidity, sweetness, bitterness, astringency and body.
① Choose method · ② Adjust parameters · ③ Interpret the result
State: Balanced·Style: Espresso
💡 Result based on current parameters
Classic balance: a good mix of intensity, sweetness and clarity.
Flavor profile
Acidity · Sweetness · Bitterness · Astringency · Body
Estimated extraction
54/100
18g → 36g (1:2.0)
Estimated time: 32s
Extraction map
≈ Espresso
Zone: Balanced
Sweet spot for espresso: sweetness and clarity with good intensity.
Note: This is an educational heuristic, not a physical measurement.
Quick presets
Tip: light roasts tend to punish underextraction more, while dark roasts bring bitterness earlier.
Saved recipes
Save your first recipe to reuse it or share it.
State: Balanced·Style: Espresso
💡 Result based on current parameters
Classic balance: a good mix of intensity, sweetness and clarity.
Flavor profile
Acidity · Sweetness · Bitterness · Astringency · Body
Estimated extraction
54/100
18g → 36g (1:2.0)
Estimated time: 32s
Extraction map
≈ Espresso
Zone: Balanced
Sweet spot for espresso: sweetness and clarity with good intensity.
Note: This is an educational heuristic, not a physical measurement.
Adjust the recipe and coffee type. The result updates in real time.
Quick presets
Tip: light roasts tend to punish underextraction more, while dark roasts bring bitterness earlier.
Saved recipes
Save your first recipe to reuse it or share it.