An exemplary voice monitoring system includes a wearable voice monitor and an auxiliary device such as a smart phone. The wearable monitor incorporates a wake-on-sound microphone, a vibration motor, and a microcontroller within a small, discreet enclosure. The enclosure can be hung from a necklace chain or affixed to clothing, like a piece of jewelry. The jewelry appearance is enhanced by a removable decorative piece. The microcontroller wakes up in response to a wake signal from the microphone when a voice sound of a wearer is detected. The microcontroller initiates measurements to determine if the voice sound meets preconfigured criteria and activates the vibration motor to alert the wearer. Sound criteria resulting in vibratory alerts are contained in a user-specific schedule tailored according to time of day and day of week. The smart phone can remotely create customized schedules and transmit them to the monitor.