The honest summary: one published spec (COSORI, 48 dB), two models with credible cited noise testing (Chefman, Dash), one with consistent lighter-weight review claims (COMFEE’), and everything else is unknown — including the three models we left out of this ranking entirely (Elite Gourmet, Instant Vortex Mini, BLACK+DECKER) because no source we could cite says anything about their noise at all. That’s thinner evidence than a “quietest” listicle usually admits to. It’s also all the evidence that actually exists. Full specs in the database.