VoiceClock -GUMI- is an Android app that provides hourly and alarm services. The app reads the current time in the voice of VOCALOID GUMI when you tap on the widget placed on your home screen. The hourly feature automatically informs the time in voice at least once every 30 minutes or 1 hour. You can also set the app to stop the time signal only for specified periods like sleep time, work, or school.

The alarm feature allows you to set an alarm to read the time out loud, making it convenient to keep an eye on the time during work or when you cannot look at the clock. The app is illustrated by Ezo Renge, and the developer borrowed his work from Piapuro. The app uses the name and illustrations of the character "GUMI" based on the character use guidelines stipulated by the Corporation Internet, non-profit and the company's character in the range of free. The app is free to use and does not require any personal or contact information.