An android (possibly iOS later) app that supports time controls for the a board game called Go (igo, weiqi, baduk) Supports individual time settings for players including Fischer, absolute, Japanese Byo-yomi and a combination of those. You can set when you hear the beep notifying you your time is running out. The pitch of the beep is randomly generated to differentiate phones from each other, can be changed manually.
Unity version 2021.3.13f1