A free interval timer for HIIT and circuits

The interval timer runs alternating work and rest periods for as many rounds as you like — built for HIIT, Tabata, circuit training, boxing and any workout that repeats. Set your work seconds, rest seconds and round count, press start, and follow the cues.

Clear audio signals mark every switch between work and rest, so you can keep your eyes off the screen and focus on training. The big readout and fullscreen mode make it easy to follow from across the gym or living room.

How to set up your intervals

1. Set rounds, then your work and rest durations with the + / − steppers.
2. Press Start — the timer counts down each work period, then each rest period.
3. It repeats automatically for every round and signals completion at the end.
4. Use Skip to advance a phase, or Reset (R) to start the session over.

Time the rest of your day too

Measure a single effort or lap with the stopwatch, set a simple countdown timer for rest between heavy sets, or use the Pomodoro timer to stay focused at your desk.