Tuning tipSour? Grind finer. Bitter? Grind coarser.

The Tuned Cup

Tune-Up · string B

Taste Problems

Every off cup points a direction: sour usually means under-extracted, bitter means over. Metallic, plastic and watery each have a cause of their own. Find which way the cup is off, and the one change that fixes it.

Still tuning this one.

Bitter, sour, metallic and watery cups, and how to make coffee taste better: those guides are on the bench right now.

Or tell the finder what's off

Still out of tune?

Tell us what's off and we'll find the fix.

    What's wrong with your coffee?