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Messages sent through the form below reach Mercus Hoffmann, who compiles the guides on Synapsis Coffee. Replies go out within a few business days.

The form below is the fastest way to get in touch.

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What is most useful to write about

  • Corrections. A brew temperature, ratio or grind reference that does not reproduce on your gear. Give your equipment and your measurements and the figure gets checked against its source.
  • Brewing problems. Sour, bitter, thin or muddy cups. State the method, the dose, the yield and the time, and the published diagnostics usually point somewhere.
  • Equipment questions. What the specifications support at your budget, and just as often, what they do not.

What this desk cannot help with

No paid reviews, no sponsored placements, no guest posts – those messages do not get a reply. No taste verdicts either: the guides report published measurements, not sensory opinions. And no medical advice about caffeine – the research describes populations, and your clinician is the right person for questions about you.