Most countdown timers are designed for a single device. If you’re presenting, teaching, running a workshop or hosting a game, this creates friction: the timer is either on your phone (so nobody else sees it) or on the presentation screen (which makes it awkward to control). Until.at separates control and display. No accounts, no setup, no pairing. Just start → share → display. The goal was to create the simplest possible way to run a shared countdown in a room.