How quiet are the quietest robot vacuums, and can they run during a baby's naptime?

The quietest models run around 50 to 55 decibels on standard mode, with the RoboVac WhisperClean 5000 measuring 52 dB — quieter than a normal conversation and about the level of a library or light rainfall. That’s quiet enough to run during naptime without waking a baby in the next room, though the trade-off is usually less suction power on deep carpet.