Connected Timer lets you create a timetable with named intervals, and have it count down on multiple devices at once.

Create the timetable and enter each interval and duration. Then, join the timetable on other devices by running the app, and selecting the timetable when it appears. Start the timetable from any device, and they will all count down together.

You could use it to:
-Run concurrent interviews or exams with multiple stations
-Run group activities/workshops, where people rotate through different stations
-Co-ordinate timings on a production line at a factory
-Set up intervals for team fitness training
-Co-ordinate a round robin tournament
-Display the timer for an event/marathon at multiple locations

Connected Timer uses Nearby services to discover timetables on devices that are within earshot (they don't need to be on the same network). Once the device has joined the timetable, Nearby is no longer needed and the timer will continue if the devices are moved apart.

Upgrade to Pro (in-app) to:
-Pause and resume across all devices in the countdown
-Message all devices in the countdown
-Reuse timetables from recent history