Interval timer
Set your work time, rest time and number of rounds, then put the phone down. A high tone starts each work round, a lower tone starts each rest, and a three-beep finish ends the session — no looking at the screen mid-set.
Common patterns: Tabata is 20 / 10 × 8 · EMOM circuits often use 40 / 20 · boxing rounds 180 / 60.
Built for ears, not eyes
Mid-workout you cannot read a screen, so the whole session is announced in sound: 980 Hz means work, 440 Hz means rest, and three rising beeps mean you are done. The phases are scheduled from timestamps — the same engine as our stopwatch — so a background tab or a locked, buzzing phone screen cannot stretch a rest period or shave a work round.
Rhythm work instead of rounds?
Intervals divide time into blocks; some training divides it into beats. If you are holding a stroke rate, a cadence or a musical tempo rather than work and rest rounds, a metronome fits better than a timer — our sister tool at MetronomeHQ holds any BPM steady while you move.
Frequently asked questions
- Can rest be zero?
- Yes — set rest to 0 and rounds run back to back, with the work tone marking each new round.
- Does the timer announce the last round differently?
- The final work round ends with the three-beep finish instead of a rest tone, so you know the session is over without counting.
- What is the total session length?
- Rounds × (work + rest), minus the rest after the final round — the readout under the clock shows the elapsed total as you go.
- Will it run with the screen off?
- The timing stays correct and the tones play while the browser is alive; a fully locked phone may suspend the page depending on the browser, which is why most people keep the tab visible during training.