What is the quietest coffee grinder available?

The Timemore Chestnut C2S is a manual coffee grinder built around CNC stainless steel conical burrs, with an adjustable grind dial for fine-to-coarse settings. It's designed for use across brew styles and is meant to be portable for home or travel, with a stated 52 mm compact body and 700 g weight. It uses a manual crank (no motor).

The Capresso Infinity Plus V2 is an all-purpose electric conical burr grinder with 16 grind settings and a slow gear-reduction motor to reduce friction and heat. It uses steel conical burrs and has a bean hopper with see-through capacity for monitoring refills. It's well-suited for making consistent grounds for common home brew methods like drip, pour-over, and French press.

The Eureka Mignon Specialita is a compact espresso-focused grinder built around 55 mm hardened steel flat burrs and a stepless micrometric grind adjustment system. It uses a 1350 RPM direct-traction motor with a touchscreen for timed dosing (2 doses + continuous) and is designed to deliver consistent espresso and brew outputs. Suitable for home baristas who want repeatable dosing with fine grind adjustability in a small footprint.