Timed Silence is a Kotlin-based application for Android, created by Felix Nüsse, that manages smartphone volume settings, allowing users to mute, vibrate, or ring with sound. The app requires initial setup permissions and features an intuitive interface with a pause/play button. Users can create custom schedules, including pre-defined ones for "Night" and "Day." The app effectively activates Do Not Disturb (DND) at scheduled times, muting notifications while allowing calls and messages from specified contacts. Additional features include Calendar integration, Keywords for managing volume levels, Bluetooth compatibility, and a Sanity Check for priority contacts. The app is available on F-Droid, with source code and APKs on GitHub.